diff --git a/Cargo.lock b/Cargo.lock
index b3b0fdcc9..442aba829 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2999,7 +2999,7 @@ checksum = "c7d73b3f436185384286bd8098d17ec07c9a7d2388a6599f824d8502b529702a"
 [[package]]
 name = "libp2p"
 version = "0.30.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "atomic",
  "bytes 0.5.6",
@@ -3061,7 +3061,7 @@ dependencies = [
 [[package]]
 name = "libp2p-core"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "asn1_der",
  "bs58 0.3.1",
@@ -3094,7 +3094,7 @@ dependencies = [
 [[package]]
 name = "libp2p-core-derive"
 version = "0.20.2"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "quote",
  "syn",
@@ -3103,7 +3103,7 @@ dependencies = [
 [[package]]
 name = "libp2p-dns"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "futures 0.3.8",
  "libp2p-core 0.24.0",
@@ -3113,7 +3113,7 @@ dependencies = [
 [[package]]
 name = "libp2p-gossipsub"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "base64 0.13.0",
  "byteorder",
@@ -3137,7 +3137,7 @@ dependencies = [
 [[package]]
 name = "libp2p-identify"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "futures 0.3.8",
  "libp2p-core 0.24.0",
@@ -3152,7 +3152,7 @@ dependencies = [
 [[package]]
 name = "libp2p-mplex"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "bytes 0.5.6",
  "futures 0.3.8",
@@ -3169,7 +3169,7 @@ dependencies = [
 [[package]]
 name = "libp2p-noise"
 version = "0.26.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "bytes 0.5.6",
  "curve25519-dalek",
@@ -3190,7 +3190,7 @@ dependencies = [
 [[package]]
 name = "libp2p-swarm"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "either",
  "futures 0.3.8",
@@ -3205,7 +3205,7 @@ dependencies = [
 [[package]]
 name = "libp2p-tcp"
 version = "0.24.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "futures 0.3.8",
  "futures-timer",
@@ -3220,7 +3220,7 @@ dependencies = [
 [[package]]
 name = "libp2p-websocket"
 version = "0.25.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "async-tls",
  "either",
@@ -3239,7 +3239,7 @@ dependencies = [
 [[package]]
 name = "libp2p-yamux"
 version = "0.27.0"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "futures 0.3.8",
  "libp2p-core 0.24.0",
@@ -3658,7 +3658,7 @@ dependencies = [
 [[package]]
 name = "multistream-select"
 version = "0.8.4"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "bytes 0.5.6",
  "futures 0.3.8",
@@ -3971,7 +3971,7 @@ dependencies = [
 [[package]]
 name = "parity-multiaddr"
 version = "0.9.3"
-source = "git+https://github.com/sigp/rust-libp2p?rev=b6278e1ba7b6bcfad1eef300f72148705da5d8d2#b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+source = "git+https://github.com/sigp/rust-libp2p?rev=f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c#f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 dependencies = [
  "arrayref",
  "bs58 0.3.1",
@@ -6519,6 +6519,7 @@ dependencies = [
  "ethereum-types",
  "hex",
  "int_to_bytes",
+ "lazy_static",
  "log 0.4.11",
  "merkle_proof",
  "rand 0.7.3",
diff --git a/beacon_node/eth2_libp2p/Cargo.toml b/beacon_node/eth2_libp2p/Cargo.toml
index cf539512a..c78fc879b 100644
--- a/beacon_node/eth2_libp2p/Cargo.toml
+++ b/beacon_node/eth2_libp2p/Cargo.toml
@@ -42,7 +42,7 @@ regex = "1.3.9"
 [dependencies.libp2p]
 #version = "0.23.0"
 git = "https://github.com/sigp/rust-libp2p"
-rev = "b6278e1ba7b6bcfad1eef300f72148705da5d8d2"
+rev = "f53d02bc873fef2bf52cd31e3d5ce366a41d8a8c"
 default-features = false
 features = ["websocket", "identify", "mplex", "yamux", "noise", "gossipsub", "dns", "tcp-tokio"]
 
diff --git a/beacon_node/eth2_libp2p/src/peer_manager/client.rs b/beacon_node/eth2_libp2p/src/peer_manager/client.rs
index f23f32be6..51fa1cb11 100644
--- a/beacon_node/eth2_libp2p/src/peer_manager/client.rs
+++ b/beacon_node/eth2_libp2p/src/peer_manager/client.rs
@@ -98,9 +98,29 @@ impl std::fmt::Display for Client {
     }
 }
 
+impl ClientKind {
+    pub fn as_static_ref(&self) -> &'static str {
+        use ClientKind::*;
+        match self {
+            Lighthouse => "Lighthouse",
+            Nimbus => "Nimbus",
+            Teku => "Teku",
+            Prysm => "Prysm",
+            Lodestar => "Lodestar",
+            Unknown => "Unknown",
+        }
+    }
+}
+
+impl AsRef<str> for ClientKind {
+    fn as_ref(&self) -> &str {
+        self.as_static_ref()
+    }
+}
+
 impl std::fmt::Display for ClientKind {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:?}", self)
+        f.write_str(self.as_ref())
     }
 }
 
diff --git a/beacon_node/eth2_libp2p/src/types/topics.rs b/beacon_node/eth2_libp2p/src/types/topics.rs
index 3f120b3ec..7409607d6 100644
--- a/beacon_node/eth2_libp2p/src/types/topics.rs
+++ b/beacon_node/eth2_libp2p/src/types/topics.rs
@@ -52,15 +52,25 @@ pub enum GossipKind {
     AttesterSlashing,
 }
 
+impl AsRef<str> for GossipKind {
+    fn as_ref(&self) -> &str {
+        use GossipKind::*;
+        match self {
+            BeaconBlock => "beacon_block",
+            BeaconAggregateAndProof => "beacon_aggregate_and_proof",
+            Attestation(_) => "beacon_attestation",
+            VoluntaryExit => "voluntary_exit",
+            ProposerSlashing => "proposer_slashing",
+            AttesterSlashing => "attester_slashing",
+        }
+    }
+}
+
 impl std::fmt::Display for GossipKind {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            GossipKind::BeaconBlock => write!(f, "beacon_block"),
-            GossipKind::BeaconAggregateAndProof => write!(f, "beacon_aggregate_and_proof"),
             GossipKind::Attestation(subnet_id) => write!(f, "beacon_attestation_{}", **subnet_id),
-            GossipKind::VoluntaryExit => write!(f, "voluntary_exit"),
-            GossipKind::ProposerSlashing => write!(f, "proposer_slashing"),
-            GossipKind::AttesterSlashing => write!(f, "attester_slashing"),
+            x => f.write_str(x.as_ref()),
         }
     }
 }
diff --git a/beacon_node/network/src/service.rs b/beacon_node/network/src/service.rs
index d0c9e4159..d517d4f10 100644
--- a/beacon_node/network/src/service.rs
+++ b/beacon_node/network/src/service.rs
@@ -20,6 +20,7 @@ use std::{collections::HashMap, net::SocketAddr, sync::Arc, time::Duration};
 use store::HotColdDB;
 use tokio::sync::mpsc;
 use tokio::time::Delay;
+use types::subnet_id::subnet_id_to_string;
 use types::{EthSpec, RelativeEpoch, SubnetId, Unsigned, ValidatorSubscription};
 
 mod tests;
@@ -275,7 +276,6 @@ fn spawn_service<T: BeaconChainTypes>(
                     update_gossip_metrics::<T::EthSpec>(
                         &service.libp2p.swarm.gs(),
                         &service.network_globals,
-                        &service.log
                     );
                 }
                 _ = service.gossipsub_parameter_update.next() => {
@@ -588,7 +588,7 @@ fn expose_publish_metrics<T: EthSpec>(messages: &[PubsubMessage<T>]) {
             PubsubMessage::Attestation(subnet_id) => {
                 metrics::inc_counter_vec(
                     &metrics::ATTESTATIONS_PUBLISHED_PER_SUBNET_PER_SLOT,
-                    &[&subnet_id.0.to_string()],
+                    &[&subnet_id.0.as_ref()],
                 );
                 metrics::inc_counter(&metrics::GOSSIP_UNAGGREGATED_ATTESTATIONS_TX)
             }
@@ -614,25 +614,9 @@ fn expose_receive_metrics<T: EthSpec>(message: &PubsubMessage<T>) {
     }
 }
 
-/// A work-around to reduce temporary allocation when updating gossip metrics.
-pub struct ToStringCache<T>(HashMap<T, String>);
-
-impl<T: Clone + std::hash::Hash + std::fmt::Display + Eq> ToStringCache<T> {
-    pub fn with_capacity(c: usize) -> Self {
-        Self(HashMap::with_capacity(c))
-    }
-
-    pub fn get(&mut self, item: T) -> &str {
-        self.0
-            .entry(item.clone())
-            .or_insert_with(|| item.to_string())
-    }
-}
-
 fn update_gossip_metrics<T: EthSpec>(
     gossipsub: &Gossipsub,
     network_globals: &Arc<NetworkGlobals<T>>,
-    logger: &slog::Logger,
 ) {
     // Clear the metrics
     let _ = metrics::PEERS_PER_PROTOCOL
@@ -683,28 +667,23 @@ fn update_gossip_metrics<T: EthSpec>(
         .as_ref()
         .map(|gauge| gauge.reset());
 
-    let mut subnet_ids: ToStringCache<u64> =
-        ToStringCache::with_capacity(T::default_spec().attestation_subnet_count as usize);
-    let mut gossip_kinds: ToStringCache<GossipKind> =
-        ToStringCache::with_capacity(T::default_spec().attestation_subnet_count as usize);
-
     // reset the mesh peers, showing all subnets
     for subnet_id in 0..T::default_spec().attestation_subnet_count {
         let _ = metrics::get_int_gauge(
             &metrics::MESH_PEERS_PER_SUBNET_TOPIC,
-            &[subnet_ids.get(subnet_id)],
+            &[subnet_id_to_string(subnet_id)],
         )
         .map(|v| v.set(0));
 
         let _ = metrics::get_int_gauge(
             &metrics::GOSSIPSUB_SUBSCRIBED_SUBNET_TOPIC,
-            &[subnet_ids.get(subnet_id)],
+            &[subnet_id_to_string(subnet_id)],
         )
         .map(|v| v.set(0));
 
         let _ = metrics::get_int_gauge(
             &metrics::GOSSIPSUB_SUBSCRIBED_PEERS_SUBNET_TOPIC,
-            &[subnet_ids.get(subnet_id)],
+            &[subnet_id_to_string(subnet_id)],
         )
         .map(|v| v.set(0));
     }
@@ -715,7 +694,7 @@ fn update_gossip_metrics<T: EthSpec>(
             if let GossipKind::Attestation(subnet_id) = topic.kind() {
                 let _ = metrics::get_int_gauge(
                     &metrics::GOSSIPSUB_SUBSCRIBED_SUBNET_TOPIC,
-                    &[subnet_ids.get(subnet_id.into())],
+                    &[subnet_id_to_string(subnet_id.into())],
                 )
                 .map(|v| v.set(1));
             }
@@ -733,7 +712,7 @@ fn update_gossip_metrics<T: EthSpec>(
                     GossipKind::Attestation(subnet_id) => {
                         if let Some(v) = metrics::get_int_gauge(
                             &metrics::GOSSIPSUB_SUBSCRIBED_PEERS_SUBNET_TOPIC,
-                            &[subnet_ids.get(subnet_id.into())],
+                            &[subnet_id_to_string(subnet_id.into())],
                         ) {
                             v.inc()
                         };
@@ -742,7 +721,7 @@ fn update_gossip_metrics<T: EthSpec>(
                         if let Some(score) = gossipsub.peer_score(peer_id) {
                             if let Some(v) = metrics::get_gauge(
                                 &metrics::AVG_GOSSIPSUB_PEER_SCORE_PER_SUBNET_TOPIC,
-                                &[subnet_ids.get(subnet_id.into())],
+                                &[subnet_id_to_string(subnet_id.into())],
                             ) {
                                 v.add(score)
                             };
@@ -753,7 +732,7 @@ fn update_gossip_metrics<T: EthSpec>(
                         if let Some(score) = gossipsub.peer_score(peer_id) {
                             if let Some(v) = metrics::get_gauge(
                                 &metrics::AVG_GOSSIPSUB_PEER_SCORE_PER_MAIN_TOPIC,
-                                &[gossip_kinds.get(kind.clone())],
+                                &[kind.as_ref()],
                             ) {
                                 v.add(score)
                             };
@@ -771,7 +750,7 @@ fn update_gossip_metrics<T: EthSpec>(
                     // average peer scores
                     if let Some(v) = metrics::get_gauge(
                         &metrics::AVG_GOSSIPSUB_PEER_SCORE_PER_SUBNET_TOPIC,
-                        &[subnet_ids.get(subnet_id.into())],
+                        &[subnet_id_to_string(subnet_id.into())],
                     ) {
                         v.set(v.get() / (*peers as f64))
                     };
@@ -780,7 +759,7 @@ fn update_gossip_metrics<T: EthSpec>(
                     // main topics
                     if let Some(v) = metrics::get_gauge(
                         &metrics::AVG_GOSSIPSUB_PEER_SCORE_PER_MAIN_TOPIC,
-                        &[&format!("{:?}", kind)],
+                        &[kind.as_ref()],
                     ) {
                         v.set(v.get() / (*peers as f64))
                     };
@@ -797,7 +776,7 @@ fn update_gossip_metrics<T: EthSpec>(
                 GossipKind::Attestation(subnet_id) => {
                     if let Some(v) = metrics::get_int_gauge(
                         &metrics::MESH_PEERS_PER_SUBNET_TOPIC,
-                        &[subnet_ids.get(subnet_id.into())],
+                        &[subnet_id_to_string(subnet_id.into())],
                     ) {
                         v.set(peers as i64)
                     };
@@ -806,7 +785,7 @@ fn update_gossip_metrics<T: EthSpec>(
                     // main topics
                     if let Some(v) = metrics::get_int_gauge(
                         &metrics::MESH_PEERS_PER_MAIN_TOPIC,
-                        &[gossip_kinds.get(kind.clone())],
+                        &[kind.as_ref()],
                     ) {
                         v.set(peers as i64)
                     };
@@ -816,35 +795,31 @@ fn update_gossip_metrics<T: EthSpec>(
     }
 
     // protocol peers
-    let mut peers_per_protocol: HashMap<String, i64> = HashMap::new();
+    let mut peers_per_protocol: HashMap<&'static str, i64> = HashMap::new();
     for (_peer, protocol) in gossipsub.peer_protocol() {
-        *peers_per_protocol.entry(protocol.to_string()).or_default() += 1;
+        *peers_per_protocol
+            .entry(protocol.as_static_ref())
+            .or_default() += 1;
     }
 
     for (protocol, peers) in peers_per_protocol.iter() {
-        if let Some(v) =
-            metrics::get_int_gauge(&metrics::PEERS_PER_PROTOCOL, &[&protocol.to_string()])
-        {
+        if let Some(v) = metrics::get_int_gauge(&metrics::PEERS_PER_PROTOCOL, &[protocol]) {
             v.set(*peers)
         };
     }
 
     let mut peer_to_client = HashMap::new();
-    let mut scores_per_client: HashMap<String, Vec<f64>> = HashMap::new();
+    let mut scores_per_client: HashMap<&'static str, Vec<f64>> = HashMap::new();
     {
         let peers = network_globals.peers.read();
         for (peer_id, _) in gossipsub.all_peers() {
             let client = peers
                 .peer_info(peer_id)
-                .map(|peer_info| peer_info.client.kind.to_string())
-                .unwrap_or_else(|| "Unknown".to_string());
+                .map(|peer_info| peer_info.client.kind.as_static_ref())
+                .unwrap_or_else(|| "Unknown");
 
-            peer_to_client.insert(peer_id, client.clone());
+            peer_to_client.insert(peer_id, client);
             let score = gossipsub.peer_score(peer_id).unwrap_or(0.0);
-            if (client == "Prysm" || client == "Lighthouse") && score < 0.0 {
-                trace!(logger, "Peer has negative score"; "peer" => format!("{:?}", peer_id),
-                       "client" => &client, "score" => score);
-            }
             scores_per_client.entry(client).or_default().push(score);
         }
     }
@@ -883,7 +858,7 @@ fn update_gossip_metrics<T: EthSpec>(
     }
 
     for (client, scores) in scores_per_client.into_iter() {
-        let c = &[client.as_ref()];
+        let c = &[client];
         let len = scores.len();
         if len > 0 {
             let mut below0 = 0;
diff --git a/consensus/types/Cargo.toml b/consensus/types/Cargo.toml
index 8984beeda..397ee7e16 100644
--- a/consensus/types/Cargo.toml
+++ b/consensus/types/Cargo.toml
@@ -41,6 +41,7 @@ rusqlite = { version = "0.24.0", features = ["bundled"], optional = true }
 arbitrary = { version = "0.4.6", features = ["derive"], optional = true }
 serde_utils = { path = "../serde_utils" }
 regex = "1.3.9"
+lazy_static = "1.4.0"
 
 [dev-dependencies]
 serde_json = "1.0.58"
diff --git a/consensus/types/src/lib.rs b/consensus/types/src/lib.rs
index 3ee69c726..b9b1950ae 100644
--- a/consensus/types/src/lib.rs
+++ b/consensus/types/src/lib.rs
@@ -5,6 +5,8 @@
 // Clippy lint set up
 #![deny(clippy::integer_arithmetic)]
 
+#[macro_use]
+extern crate lazy_static;
 #[macro_use]
 pub mod test_utils;
 
diff --git a/consensus/types/src/subnet_id.rs b/consensus/types/src/subnet_id.rs
index f03506230..9b54af169 100644
--- a/consensus/types/src/subnet_id.rs
+++ b/consensus/types/src/subnet_id.rs
@@ -4,11 +4,34 @@ use safe_arith::{ArithError, SafeArith};
 use serde_derive::{Deserialize, Serialize};
 use std::ops::{Deref, DerefMut};
 
+const MAX_SUBNET_ID: usize = 64;
+
+lazy_static! {
+    static ref SUBNET_ID_TO_STRING: Vec<String> = {
+        let mut v = Vec::with_capacity(MAX_SUBNET_ID);
+
+        for i in 0..MAX_SUBNET_ID {
+            v.push(i.to_string());
+        }
+        v
+    };
+}
+
 #[cfg_attr(feature = "arbitrary-fuzz", derive(arbitrary::Arbitrary))]
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 #[serde(transparent)]
 pub struct SubnetId(#[serde(with = "serde_utils::quoted_u64")] u64);
 
+pub fn subnet_id_to_string(i: u64) -> &'static str {
+    if i < MAX_SUBNET_ID as u64 {
+        &SUBNET_ID_TO_STRING
+            .get(i as usize)
+            .expect("index below MAX_SUBNET_ID")
+    } else {
+        "subnet id out of range"
+    }
+}
+
 impl SubnetId {
     pub fn new(id: u64) -> Self {
         id.into()
@@ -81,3 +104,9 @@ impl Into<u64> for &SubnetId {
         self.0
     }
 }
+
+impl AsRef<str> for SubnetId {
+    fn as_ref(&self) -> &str {
+        subnet_id_to_string(self.0)
+    }
+}