Port 30939 (dilithium3)

IANA assigns port 30939 to dilithium3: Persistent peer-to-peer connections for block propagation, transaction relay, and BFT consensus message exchange..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

dilithium3 TCP Persistent peer-to-peer connections for block propagation, transaction relay, and BFT consensus message exchange. Juan Jose Todoli de Torres -

dilithium3 UDP Kademlia DHT peer discovery and routing table maintenance. Juan Jose Todoli de Torres -

Registry dates for this port: registered 2026-05-28.

Check what is listening on port 30939

Linux: is anything listening on TCP 30939?

sudo ss -tlnp 'sport = :30939'

Linux: UDP 30939

sudo ss -ulnp 'sport = :30939'

Linux / macOS: which process owns the port

sudo lsof -nP -i :30939

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':30939 '

Windows (Command Prompt)

netstat -ano | findstr :30939

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 30939 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 30939

From Windows

Test-NetConnection HOST -Port 30939

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 30939

Block port 30939 in the firewall

ufw

sudo ufw deny 30939/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 30939 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 30939 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 30939' -Direction Inbound -Protocol TCP -LocalPort 30939 -Action Block

ufw

sudo ufw deny 30939/udp