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Port 12013 (vipera-ssl)

IANA assigns port 12013 to vipera-ssl: Vipera Messaging Service over SSL Communication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vipera-ssl TCP Vipera Messaging Service over SSL Communication Silvano Maffeis 2 -
vipera-ssl UDP Vipera Messaging Service over SSL Communication Silvano Maffeis 2 -

Registry dates for this port: registered 2008-01-16.

Check what is listening on port 12013

Linux: is anything listening on TCP 12013?
sudo ss -tlnp 'sport = :12013'
Linux: UDP 12013
sudo ss -ulnp 'sport = :12013'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12013
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12013 '
Windows (Command Prompt)
netstat -ano | findstr :12013
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12013 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12013
From Windows
Test-NetConnection HOST -Port 12013
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12013

Block port 12013 in the firewall

ufw
sudo ufw deny 12013/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12013 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12013 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12013' -Direction Inbound -Protocol TCP -LocalPort 12013 -Action Block
ufw
sudo ufw deny 12013/udp
iptables
sudo iptables -A INPUT -p udp --dport 12013 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12013 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12013' -Direction Inbound -Protocol UDP -LocalPort 12013 -Action Block

Related ports

12010edbsrvr12012vipera12109rets-ssl12121nupaper-ss

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