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Port 26133 (scscp)

IANA assigns port 26133 to scscp: Symbolic Computation Software Composability Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
scscp TCP Symbolic Computation Software Composability Protocol Alexander Konovalov -
scscp UDP Symbolic Computation Software Composability Protocol Alexander Konovalov -

Registry dates for this port: registered 2007-11-27.

Check what is listening on port 26133

Linux: is anything listening on TCP 26133?
sudo ss -tlnp 'sport = :26133'
Linux: UDP 26133
sudo ss -ulnp 'sport = :26133'
Linux / macOS: which process owns the port
sudo lsof -nP -i :26133
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':26133 '
Windows (Command Prompt)
netstat -ano | findstr :26133
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 26133 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 26133
From Windows
Test-NetConnection HOST -Port 26133
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 26133

Block port 26133 in the firewall

ufw
sudo ufw deny 26133/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 26133 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 26133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 26133' -Direction Inbound -Protocol TCP -LocalPort 26133 -Action Block
ufw
sudo ufw deny 26133/udp
iptables
sudo iptables -A INPUT -p udp --dport 26133 -j DROP
nftables
sudo nft add rule inet filter input udp dport 26133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 26133' -Direction Inbound -Protocol UDP -LocalPort 26133 -Action Block

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