HTTPfy

Port 3485 (celatalk)

IANA assigns port 3485 to celatalk: CelaTalk.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
celatalk TCP CelaTalk Carl Blundell -
celatalk UDP CelaTalk Carl Blundell -

Registry dates for this port: registered 2002-05.

Check what is listening on port 3485

Linux: is anything listening on TCP 3485?
sudo ss -tlnp 'sport = :3485'
Linux: UDP 3485
sudo ss -ulnp 'sport = :3485'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3485
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3485 '
Windows (Command Prompt)
netstat -ano | findstr :3485
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3485 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3485
From Windows
Test-NetConnection HOST -Port 3485
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3485

Block port 3485 in the firewall

ufw
sudo ufw deny 3485/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3485 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3485 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3485' -Direction Inbound -Protocol TCP -LocalPort 3485 -Action Block
ufw
sudo ufw deny 3485/udp
iptables
sudo iptables -A INPUT -p udp --dport 3485 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3485 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3485' -Direction Inbound -Protocol UDP -LocalPort 3485 -Action Block

Related ports

3483slim-devices3484gbs-stp3486ifsf-hb-port3487ltctcp, ltcudp

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