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Port 3135 (peerbook-port)

IANA assigns port 3135 to peerbook-port: PeerBook Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
peerbook-port TCP PeerBook Port John Flowers -
peerbook-port UDP PeerBook Port John Flowers -

Check what is listening on port 3135

Linux: is anything listening on TCP 3135?
sudo ss -tlnp 'sport = :3135'
Linux: UDP 3135
sudo ss -ulnp 'sport = :3135'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3135
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3135 '
Windows (Command Prompt)
netstat -ano | findstr :3135
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3135 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3135
From Windows
Test-NetConnection HOST -Port 3135
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3135

Block port 3135 in the firewall

ufw
sudo ufw deny 3135/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3135 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3135 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3135' -Direction Inbound -Protocol TCP -LocalPort 3135 -Action Block
ufw
sudo ufw deny 3135/udp
iptables
sudo iptables -A INPUT -p udp --dport 3135 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3135 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3135' -Direction Inbound -Protocol UDP -LocalPort 3135 -Action Block

Related ports

3133prism-deploy3134ecp3136grubd3137rtnt-1

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.