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Port 188 (mumps)

IANA assigns port 188 to mumps: Plus Five's MUMPS.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
mumps TCP Plus Five's MUMPS Hokey Stenn -
mumps UDP Plus Five's MUMPS Hokey Stenn -

Check what is listening on port 188

Linux: is anything listening on TCP 188?
sudo ss -tlnp 'sport = :188'
Linux: UDP 188
sudo ss -ulnp 'sport = :188'
Linux / macOS: which process owns the port
sudo lsof -nP -i :188
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':188 '
Windows (Command Prompt)
netstat -ano | findstr :188
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 188 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 188
From Windows
Test-NetConnection HOST -Port 188
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 188

Block port 188 in the firewall

ufw
sudo ufw deny 188/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 188 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 188 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 188' -Direction Inbound -Protocol TCP -LocalPort 188 -Action Block
ufw
sudo ufw deny 188/udp
iptables
sudo iptables -A INPUT -p udp --dport 188 -j DROP
nftables
sudo nft add rule inet filter input udp dport 188 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 188' -Direction Inbound -Protocol UDP -LocalPort 188 -Action Block

Related ports

186kis187aci189qft190gacp

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