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Port 2031 (mobrien-chat)

IANA assigns port 2031 to mobrien-chat.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mobrien-chat TCP mobrien-chat Mike O Brien -
mobrien-chat UDP mobrien-chat Mike O Brien -

Registry dates for this port: registered 2004-11.

Check what is listening on port 2031

Linux: is anything listening on TCP 2031?
sudo ss -tlnp 'sport = :2031'
Linux: UDP 2031
sudo ss -ulnp 'sport = :2031'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2031
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2031 '
Windows (Command Prompt)
netstat -ano | findstr :2031
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2031 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2031
From Windows
Test-NetConnection HOST -Port 2031
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2031

Block port 2031 in the firewall

ufw
sudo ufw deny 2031/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2031 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2031 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2031' -Direction Inbound -Protocol TCP -LocalPort 2031 -Action Block
ufw
sudo ufw deny 2031/udp
iptables
sudo iptables -A INPUT -p udp --dport 2031 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2031 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2031' -Direction Inbound -Protocol UDP -LocalPort 2031 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.