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Port 2568 (spamtrap)

IANA assigns port 2568 to spamtrap: SPAM TRAP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
spamtrap TCP SPAM TRAP Charles Bennett -
spamtrap UDP SPAM TRAP Charles Bennett -

Registry dates for this port: registered 2008-08-29.

Check what is listening on port 2568

Linux: is anything listening on TCP 2568?
sudo ss -tlnp 'sport = :2568'
Linux: UDP 2568
sudo ss -ulnp 'sport = :2568'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2568
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2568 '
Windows (Command Prompt)
netstat -ano | findstr :2568
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2568 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2568
From Windows
Test-NetConnection HOST -Port 2568
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2568

Block port 2568 in the firewall

ufw
sudo ufw deny 2568/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2568 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2568 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2568' -Direction Inbound -Protocol TCP -LocalPort 2568 -Action Block
ufw
sudo ufw deny 2568/udp
iptables
sudo iptables -A INPUT -p udp --dport 2568 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2568 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2568' -Direction Inbound -Protocol UDP -LocalPort 2568 -Action Block

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