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Port 168 (rsvd)

IANA assigns port 168 to rsvd: RSVD.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
rsvd TCP RSVD Alan Sandell -
rsvd UDP RSVD Alan Sandell -

Registry dates for this port: last modified 2008-05-01.

Check what is listening on port 168

Linux: is anything listening on TCP 168?
sudo ss -tlnp 'sport = :168'
Linux: UDP 168
sudo ss -ulnp 'sport = :168'
Linux / macOS: which process owns the port
sudo lsof -nP -i :168
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':168 '
Windows (Command Prompt)
netstat -ano | findstr :168
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 168 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 168
From Windows
Test-NetConnection HOST -Port 168
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 168

Block port 168 in the firewall

ufw
sudo ufw deny 168/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 168 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 168 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 168' -Direction Inbound -Protocol TCP -LocalPort 168 -Action Block
ufw
sudo ufw deny 168/udp
iptables
sudo iptables -A INPUT -p udp --dport 168 -j DROP
nftables
sudo nft add rule inet filter input udp dport 168 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 168' -Direction Inbound -Protocol UDP -LocalPort 168 -Action Block

Related ports

166s-net167namp169send170print-srv

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