HTTPfy

Port 1231 (menandmice-lpm)

IANA assigns port 1231 to menandmice-lpm.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
menandmice-lpm TCP menandmice-lpm Sigfus Magnusson -
menandmice-lpm UDP menandmice-lpm Sigfus Magnusson -

Check what is listening on port 1231

Linux: is anything listening on TCP 1231?
sudo ss -tlnp 'sport = :1231'
Linux: UDP 1231
sudo ss -ulnp 'sport = :1231'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1231
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1231 '
Windows (Command Prompt)
netstat -ano | findstr :1231
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1231 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1231
From Windows
Test-NetConnection HOST -Port 1231
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1231

Block port 1231 in the firewall

ufw
sudo ufw deny 1231/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1231 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1231 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1231' -Direction Inbound -Protocol TCP -LocalPort 1231 -Action Block
ufw
sudo ufw deny 1231/udp
iptables
sudo iptables -A INPUT -p udp --dport 1231 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1231 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1231' -Direction Inbound -Protocol UDP -LocalPort 1231 -Action Block

Related ports

1229zented1230periscope1232first-defense1233univ-appserver

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