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Port 1253 (q55-pcc)

IANA assigns port 1253 to q55-pcc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
q55-pcc TCP q55-pcc Prem Tirilok -
q55-pcc UDP q55-pcc Prem Tirilok -

Check what is listening on port 1253

Linux: is anything listening on TCP 1253?
sudo ss -tlnp 'sport = :1253'
Linux: UDP 1253
sudo ss -ulnp 'sport = :1253'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1253
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1253 '
Windows (Command Prompt)
netstat -ano | findstr :1253
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1253 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1253
From Windows
Test-NetConnection HOST -Port 1253
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1253

Block port 1253 in the firewall

ufw
sudo ufw deny 1253/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1253 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1253' -Direction Inbound -Protocol TCP -LocalPort 1253 -Action Block
ufw
sudo ufw deny 1253/udp
iptables
sudo iptables -A INPUT -p udp --dport 1253 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1253' -Direction Inbound -Protocol UDP -LocalPort 1253 -Action Block

Related ports

1251servergraph1252bspne-pcc1254de-noc1255de-cache-query

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