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Port 12012 (vipera)

IANA assigns port 12012 to vipera: Vipera Messaging Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vipera TCP Vipera Messaging Service Silvano Maffeis 2 -
vipera UDP Vipera Messaging Service Silvano Maffeis 2 -

Registry dates for this port: registered 2005-08.

Check what is listening on port 12012

Linux: is anything listening on TCP 12012?
sudo ss -tlnp 'sport = :12012'
Linux: UDP 12012
sudo ss -ulnp 'sport = :12012'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12012
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12012 '
Windows (Command Prompt)
netstat -ano | findstr :12012
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12012 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12012
From Windows
Test-NetConnection HOST -Port 12012
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12012

Block port 12012 in the firewall

ufw
sudo ufw deny 12012/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12012 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12012 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12012' -Direction Inbound -Protocol TCP -LocalPort 12012 -Action Block
ufw
sudo ufw deny 12012/udp
iptables
sudo iptables -A INPUT -p udp --dport 12012 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12012 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12012' -Direction Inbound -Protocol UDP -LocalPort 12012 -Action Block

Related ports

12009ghvpn12010edbsrvr12013vipera-ssl12109rets-ssl

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