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Port 1660 (skip-mc-gikreq)

IANA assigns port 1660 to skip-mc-gikreq.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
skip-mc-gikreq TCP skip-mc-gikreq Tom Markson -
skip-mc-gikreq UDP skip-mc-gikreq Tom Markson -

Check what is listening on port 1660

Linux: is anything listening on TCP 1660?
sudo ss -tlnp 'sport = :1660'
Linux: UDP 1660
sudo ss -ulnp 'sport = :1660'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1660
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1660 '
Windows (Command Prompt)
netstat -ano | findstr :1660
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1660 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1660
From Windows
Test-NetConnection HOST -Port 1660
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1660

Block port 1660 in the firewall

ufw
sudo ufw deny 1660/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1660 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1660' -Direction Inbound -Protocol TCP -LocalPort 1660 -Action Block
ufw
sudo ufw deny 1660/udp
iptables
sudo iptables -A INPUT -p udp --dport 1660 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1660' -Direction Inbound -Protocol UDP -LocalPort 1660 -Action Block

Related ports

1658sixnetudr1659sg-lm1661netview-aix-11662netview-aix-2

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