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Port 496 (pim-rp-disc)

IANA assigns port 496 to pim-rp-disc: PIM-RP-DISC.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
pim-rp-disc TCP PIM-RP-DISC Dino Farinacci -
pim-rp-disc UDP PIM-RP-DISC Dino Farinacci -

Check what is listening on port 496

Linux: is anything listening on TCP 496?
sudo ss -tlnp 'sport = :496'
Linux: UDP 496
sudo ss -ulnp 'sport = :496'
Linux / macOS: which process owns the port
sudo lsof -nP -i :496
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':496 '
Windows (Command Prompt)
netstat -ano | findstr :496
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 496 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 496
From Windows
Test-NetConnection HOST -Port 496
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 496

Block port 496 in the firewall

ufw
sudo ufw deny 496/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 496 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 496 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 496' -Direction Inbound -Protocol TCP -LocalPort 496 -Action Block
ufw
sudo ufw deny 496/udp
iptables
sudo iptables -A INPUT -p udp --dport 496 -j DROP
nftables
sudo nft add rule inet filter input udp dport 496 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 496' -Direction Inbound -Protocol UDP -LocalPort 496 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.