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Port 3435 (pacom)

IANA assigns port 3435 to pacom: Pacom Security User Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pacom TCP Pacom Security User Port Steve Barton -
pacom UDP Pacom Security User Port Steve Barton -

Registry dates for this port: registered 2002-03.

Check what is listening on port 3435

Linux: is anything listening on TCP 3435?
sudo ss -tlnp 'sport = :3435'
Linux: UDP 3435
sudo ss -ulnp 'sport = :3435'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3435
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3435 '
Windows (Command Prompt)
netstat -ano | findstr :3435
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3435 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3435
From Windows
Test-NetConnection HOST -Port 3435
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3435

Block port 3435 in the firewall

ufw
sudo ufw deny 3435/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3435 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3435 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3435' -Direction Inbound -Protocol TCP -LocalPort 3435 -Action Block
ufw
sudo ufw deny 3435/udp
iptables
sudo iptables -A INPUT -p udp --dport 3435 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3435 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3435' -Direction Inbound -Protocol UDP -LocalPort 3435 -Action Block

Related ports

3433opnet-smp3434opencm3436gc-config3437autocueds

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