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Port 118 (sqlserv)

IANA assigns port 118 to sqlserv: SQL Services.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sqlserv TCP SQL Services Larry Barnes -
sqlserv UDP SQL Services Larry Barnes -

Check what is listening on port 118

Linux: is anything listening on TCP 118?
sudo ss -tlnp 'sport = :118'
Linux: UDP 118
sudo ss -ulnp 'sport = :118'
Linux / macOS: which process owns the port
sudo lsof -nP -i :118
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':118 '
Windows (Command Prompt)
netstat -ano | findstr :118
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 118 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 118
From Windows
Test-NetConnection HOST -Port 118
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 118

Block port 118 in the firewall

ufw
sudo ufw deny 118/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 118 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 118 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 118' -Direction Inbound -Protocol TCP -LocalPort 118 -Action Block
ufw
sudo ufw deny 118/udp
iptables
sudo iptables -A INPUT -p udp --dport 118 -j DROP
nftables
sudo nft add rule inet filter input udp dport 118 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 118' -Direction Inbound -Protocol UDP -LocalPort 118 -Action Block

Related ports

116ansanotify117uucp-path119NNTP120cfdptkt

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