diff --git a/core/commands/id.go b/core/commands/id.go
index 887f93efe311..f8d6cbb1b4a1 100644
--- a/core/commands/id.go
+++ b/core/commands/id.go
@@ -176,18 +176,18 @@ func printPeer(keyEnc ke.KeyEncoder, ps pstore.Peerstore, p peer.ID) (interface{
 
 	protocols, _ := ps.GetProtocols(p) // don't care about errors here.
 	for _, p := range protocols {
-		info.Protocols = append(info.Protocols, string(p))
+		info.Protocols = append(info.Protocols, version.TrimVersion(string(p)))
 	}
 	sort.Strings(info.Protocols)
 
 	if v, err := ps.Get(p, "ProtocolVersion"); err == nil {
 		if vs, ok := v.(string); ok {
-			info.ProtocolVersion = vs
+			info.ProtocolVersion = version.TrimVersion(vs)
 		}
 	}
 	if v, err := ps.Get(p, "AgentVersion"); err == nil {
 		if vs, ok := v.(string); ok {
-			info.AgentVersion = vs
+			info.AgentVersion = version.TrimVersion(vs)
 		}
 	}
 
diff --git a/core/commands/stat_dht.go b/core/commands/stat_dht.go
index e6006e439d3b..54a2a8477974 100644
--- a/core/commands/stat_dht.go
+++ b/core/commands/stat_dht.go
@@ -6,6 +6,7 @@ import (
 	"text/tabwriter"
 	"time"
 
+	version "github.com/ipfs/kubo"
 	cmdenv "github.com/ipfs/kubo/core/commands/cmdenv"
 
 	cmds "github.com/ipfs/go-ipfs-cmds"
@@ -92,7 +93,9 @@ This interface is not stable and may change from release to release.
 						info := dhtPeerInfo{ID: p.String()}
 
 						if ver, err := nd.Peerstore.Get(p, "AgentVersion"); err == nil {
-							info.AgentVersion, _ = ver.(string)
+							if vs, ok := ver.(string); ok {
+								info.AgentVersion = version.TrimVersion(vs)
+							}
 						} else if err == pstore.ErrNotFound {
 							// ignore
 						} else {
@@ -143,7 +146,9 @@ This interface is not stable and may change from release to release.
 				info := dhtPeerInfo{ID: pi.Id.String()}
 
 				if ver, err := nd.Peerstore.Get(pi.Id, "AgentVersion"); err == nil {
-					info.AgentVersion, _ = ver.(string)
+					if vs, ok := ver.(string); ok {
+						info.AgentVersion = version.TrimVersion(vs)
+					}
 				} else if err == pstore.ErrNotFound {
 					// ignore
 				} else {
diff --git a/core/commands/swarm.go b/core/commands/swarm.go
index 1508efcb8a8f..9e6d53c67120 100644
--- a/core/commands/swarm.go
+++ b/core/commands/swarm.go
@@ -13,6 +13,7 @@ import (
 	"time"
 
 	files "github.com/ipfs/go-ipfs-files"
+	version "github.com/ipfs/kubo"
 	"github.com/ipfs/kubo/commands"
 	"github.com/ipfs/kubo/config"
 	"github.com/ipfs/kubo/core/commands/cmdenv"
@@ -284,7 +285,7 @@ var swarmPeersCmd = &cmds.Command{
 				}
 
 				for _, s := range strs {
-					ci.Streams = append(ci.Streams, streamInfo{Protocol: string(s)})
+					ci.Streams = append(ci.Streams, streamInfo{Protocol: version.TrimVersion(string(s))})
 				}
 			}
 			sort.Sort(&ci)
diff --git a/test/sharness/t0026-id.sh b/test/sharness/t0026-id.sh
index 5d6d3db094a4..ae6650db89da 100755
--- a/test/sharness/t0026-id.sh
+++ b/test/sharness/t0026-id.sh
@@ -23,7 +23,8 @@ test_id_compute_agent() {
       fi
       AGENT_VERSION="$AGENT_VERSION$AGENT_SUFFIX"
     fi
-    echo "$AGENT_VERSION"
+    # limit of 64 characters: https://github.com/ipfs/kubo/pull/9465
+    echo -n "$AGENT_VERSION" | head -c 64
 }
 
 test_expect_success "checking AgentVersion" '
@@ -52,20 +53,22 @@ test_expect_success "checking and converting ID of a random peer while offline"
 '
 
 # agent-version-suffix (local, offline)
-test_launch_ipfs_daemon --agent-version-suffix=test-suffix
-test_expect_success "checking AgentVersion with suffix (local)" '
-  test_id_compute_agent test-suffix > expected-agent-version &&
-  ipfs id -f "<aver>\n" > actual-agent-version &&
-  test_cmp expected-agent-version actual-agent-version
+test_launch_ipfs_daemon --agent-version-suffix=test-suffix-ąę-123456789012345678901234567890
+test_expect_success "checking AgentVersion with suffix (local, only ascii chars)" '
+  test_id_compute_agent "test-suffix--1234567890123456789" > expected &&
+  ipfs id -f "<aver>" > actual &&
+  test_should_not_contain "ą" actual &&
+  test_cmp expected actual
 '
 
 # agent-version-suffix (over libp2p identify protocol)
 iptb testbed create -type localipfs -count 2 -init
-startup_cluster 2 --agent-version-suffix=test-suffix-identify
+startup_cluster 2 --agent-version-suffix=test-suffix-identify-óź-123456789012345678901234567890
 test_expect_success "checking AgentVersion with suffix (fetched via libp2p identify protocol)" '
-  ipfsi 0 id -f "<aver>\n" > expected-identify-agent-version &&
-  ipfsi 1 id "$(ipfsi 0 config Identity.PeerID)" -f "<aver>\n" > actual-libp2p-identify-agent-version &&
-  test_cmp expected-identify-agent-version actual-libp2p-identify-agent-version
+  test_id_compute_agent "test-suffix-identify--1234567890" > expected &&
+  ipfsi 1 id "$(ipfsi 0 config Identity.PeerID)" -f "<aver>" > actual &&
+  test_should_not_contain "ó" actual &&
+  test_cmp expected actual
 '
 test_kill_ipfs_daemon
 
diff --git a/version.go b/version.go
index 2762442eeab1..26c5a7d04ac3 100644
--- a/version.go
+++ b/version.go
@@ -2,6 +2,7 @@ package ipfs
 
 import (
 	"fmt"
+	"regexp"
 	"runtime"
 
 	"github.com/ipfs/kubo/repo/fsrepo"
@@ -15,6 +16,8 @@ const CurrentVersionNumber = "0.18.0-dev"
 
 const ApiVersion = "/kubo/" + CurrentVersionNumber + "/" //nolint
 
+const maxVersionLen = 64
+
 // GetUserAgentVersion is the libp2p user agent used by go-ipfs.
 //
 // Note: This will end in `/` when no commit is available. This is expected.
@@ -26,13 +29,27 @@ func GetUserAgentVersion() string {
 		}
 		userAgent += userAgentSuffix
 	}
-	return userAgent
+	return TrimVersion(userAgent)
 }
 
 var userAgentSuffix string
+var onlyASCII = regexp.MustCompile("[[:^ascii:]]")
 
 func SetUserAgentSuffix(suffix string) {
-	userAgentSuffix = suffix
+	userAgentSuffix = TrimVersion(suffix)
+}
+
+func TrimVersion(version string) string {
+	ascii := onlyASCII.ReplaceAllLiteralString(version, "")
+	chars := 0
+	for i := range ascii {
+		if chars >= maxVersionLen {
+			ascii = ascii[:i]
+			break
+		}
+		chars++
+	}
+	return ascii
 }
 
 type VersionInfo struct {