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Port 2906 (caller9)

IANA assigns port 2906 to caller9: CALLER9.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
caller9 TCP CALLER9 Shams Naqi -
caller9 UDP CALLER9 Shams Naqi -

Check what is listening on port 2906

Linux: is anything listening on TCP 2906?
sudo ss -tlnp 'sport = :2906'
Linux: UDP 2906
sudo ss -ulnp 'sport = :2906'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2906
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2906 '
Windows (Command Prompt)
netstat -ano | findstr :2906
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2906 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2906
From Windows
Test-NetConnection HOST -Port 2906
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2906

Block port 2906 in the firewall

ufw
sudo ufw deny 2906/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2906 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2906 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2906' -Direction Inbound -Protocol TCP -LocalPort 2906 -Action Block
ufw
sudo ufw deny 2906/udp
iptables
sudo iptables -A INPUT -p udp --dport 2906 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2906 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2906' -Direction Inbound -Protocol UDP -LocalPort 2906 -Action Block

Related ports

2904m2ua2905m3ua, De-registered2907webmethods-b2b2908mao

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