HTTPfy

Port 31457 (tetrinet)

IANA assigns port 31457 to tetrinet: TetriNET Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tetrinet TCP TetriNET Protocol Emmanuel Bourg -
tetrinet UDP TetriNET Protocol Emmanuel Bourg -

Registry dates for this port: registered 2004-11.

Check what is listening on port 31457

Linux: is anything listening on TCP 31457?
sudo ss -tlnp 'sport = :31457'
Linux: UDP 31457
sudo ss -ulnp 'sport = :31457'
Linux / macOS: which process owns the port
sudo lsof -nP -i :31457
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':31457 '
Windows (Command Prompt)
netstat -ano | findstr :31457
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 31457 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 31457
From Windows
Test-NetConnection HOST -Port 31457
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 31457

Block port 31457 in the firewall

ufw
sudo ufw deny 31457/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 31457 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 31457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 31457' -Direction Inbound -Protocol TCP -LocalPort 31457 -Action Block
ufw
sudo ufw deny 31457/udp
iptables
sudo iptables -A INPUT -p udp --dport 31457 -j DROP
nftables
sudo nft add rule inet filter input udp dport 31457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 31457' -Direction Inbound -Protocol UDP -LocalPort 31457 -Action Block

Related ports

31400pace-licensed31416xqosd31620lm-mon31685dsx-monitor, dsx_monitor

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