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Port 8953 (ub-dns-control)

IANA assigns port 8953 to ub-dns-control: unbound dns nameserver control.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ub-dns-control TCP unbound dns nameserver control NLnet Labs Support -

Registry dates for this port: registered 2011-05-10, last modified 2011-07-11.

Check what is listening on port 8953

Linux: is anything listening on TCP 8953?
sudo ss -tlnp 'sport = :8953'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8953
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8953 '
Windows (Command Prompt)
netstat -ano | findstr :8953
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8953 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8953
From Windows
Test-NetConnection HOST -Port 8953

Block port 8953 in the firewall

ufw
sudo ufw deny 8953/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8953 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8953 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8953' -Direction Inbound -Protocol TCP -LocalPort 8953 -Action Block

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