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Port 3486 (ifsf-hb-port)

IANA assigns port 3486 to ifsf-hb-port: IFSF Heartbeat Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ifsf-hb-port TCP IFSF Heartbeat Port IFSF Secretary -
ifsf-hb-port UDP IFSF Heartbeat Port IFSF Secretary -

Registry dates for this port: registered 2002-05.

Check what is listening on port 3486

Linux: is anything listening on TCP 3486?
sudo ss -tlnp 'sport = :3486'
Linux: UDP 3486
sudo ss -ulnp 'sport = :3486'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3486
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3486 '
Windows (Command Prompt)
netstat -ano | findstr :3486
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3486 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3486
From Windows
Test-NetConnection HOST -Port 3486
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3486

Block port 3486 in the firewall

ufw
sudo ufw deny 3486/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3486 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3486 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3486' -Direction Inbound -Protocol TCP -LocalPort 3486 -Action Block
ufw
sudo ufw deny 3486/udp
iptables
sudo iptables -A INPUT -p udp --dport 3486 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3486 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3486' -Direction Inbound -Protocol UDP -LocalPort 3486 -Action Block

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3484gbs-stp3485celatalk3487ltctcp, ltcudp3488fs-rh-srv

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