HTTPfy

Port 22555 (vocaltec-wconf, vocaltec-phone)

IANA assigns port 22555 to vocaltec-wconf, vocaltec-phone: Vocaltec Web Conference.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vocaltec-wconf TCP Vocaltec Web Conference Scott Petrack -
vocaltec-phone UDP Vocaltec Internet Phone Scott Petrack -

Check what is listening on port 22555

Linux: is anything listening on TCP 22555?
sudo ss -tlnp 'sport = :22555'
Linux: UDP 22555
sudo ss -ulnp 'sport = :22555'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22555
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22555 '
Windows (Command Prompt)
netstat -ano | findstr :22555
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22555 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22555
From Windows
Test-NetConnection HOST -Port 22555
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 22555

Block port 22555 in the firewall

ufw
sudo ufw deny 22555/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22555 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22555 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22555' -Direction Inbound -Protocol TCP -LocalPort 22555 -Action Block
ufw
sudo ufw deny 22555/udp
iptables
sudo iptables -A INPUT -p udp --dport 22555 -j DROP
nftables
sudo nft add rule inet filter input udp dport 22555 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 22555' -Direction Inbound -Protocol UDP -LocalPort 22555 -Action Block

Related ports

22351codemeter-cmwan22537caldsoft-backup22763talikaserver22800aws-brf

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