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Port 1181 (3comnetman)

IANA assigns port 1181 to 3comnetman: 3Com Net Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3comnetman TCP 3Com Net Management Peter White -
3comnetman UDP 3Com Net Management Peter White -

Registry dates for this port: registered 2004-11.

Check what is listening on port 1181

Linux: is anything listening on TCP 1181?
sudo ss -tlnp 'sport = :1181'
Linux: UDP 1181
sudo ss -ulnp 'sport = :1181'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1181
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1181 '
Windows (Command Prompt)
netstat -ano | findstr :1181
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1181 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1181
From Windows
Test-NetConnection HOST -Port 1181
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1181

Block port 1181 in the firewall

ufw
sudo ufw deny 1181/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1181 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1181 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1181' -Direction Inbound -Protocol TCP -LocalPort 1181 -Action Block
ufw
sudo ufw deny 1181/udp
iptables
sudo iptables -A INPUT -p udp --dport 1181 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1181 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1181' -Direction Inbound -Protocol UDP -LocalPort 1181 -Action Block

Related ports

1179b2n1180mc-client1182accelenet, accelenet-data1183llsurfup-http

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