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Port 26257 (cockroach)

IANA assigns port 26257 to cockroach: CockroachDB.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cockroach TCP CockroachDB Cockroach Labs Inc -

Registry dates for this port: registered 2015-09-29.

Check what is listening on port 26257

Linux: is anything listening on TCP 26257?
sudo ss -tlnp 'sport = :26257'
Linux / macOS: which process owns the port
sudo lsof -nP -i :26257
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':26257 '
Windows (Command Prompt)
netstat -ano | findstr :26257
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 26257 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 26257
From Windows
Test-NetConnection HOST -Port 26257

Block port 26257 in the firewall

ufw
sudo ufw deny 26257/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 26257 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 26257 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 26257' -Direction Inbound -Protocol TCP -LocalPort 26257 -Action Block

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