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Port 132 (cisco-sys)

IANA assigns port 132 to cisco-sys: cisco SYSMAINT.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
cisco-sys TCP cisco SYSMAINT - -
cisco-sys UDP cisco SYSMAINT - -

Check what is listening on port 132

Linux: is anything listening on TCP 132?
sudo ss -tlnp 'sport = :132'
Linux: UDP 132
sudo ss -ulnp 'sport = :132'
Linux / macOS: which process owns the port
sudo lsof -nP -i :132
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':132 '
Windows (Command Prompt)
netstat -ano | findstr :132
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 132 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 132
From Windows
Test-NetConnection HOST -Port 132
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 132

Block port 132 in the firewall

ufw
sudo ufw deny 132/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 132 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 132 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 132' -Direction Inbound -Protocol TCP -LocalPort 132 -Action Block
ufw
sudo ufw deny 132/udp
iptables
sudo iptables -A INPUT -p udp --dport 132 -j DROP
nftables
sudo nft add rule inet filter input udp dport 132 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 132' -Direction Inbound -Protocol UDP -LocalPort 132 -Action Block

Related ports

130cisco-fna131cisco-tna133statsrv134ingres-net

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