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Port 10252 (apollo-relay)

IANA assigns port 10252 to apollo-relay: Apollo Relay Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apollo-relay TCP Apollo Relay Port Anthony Carrabino -
apollo-relay UDP Apollo Relay Port Anthony Carrabino -

Registry dates for this port: registered 2003-08.

Check what is listening on port 10252

Linux: is anything listening on TCP 10252?
sudo ss -tlnp 'sport = :10252'
Linux: UDP 10252
sudo ss -ulnp 'sport = :10252'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10252
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10252 '
Windows (Command Prompt)
netstat -ano | findstr :10252
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10252 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10252
From Windows
Test-NetConnection HOST -Port 10252
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10252

Block port 10252 in the firewall

ufw
sudo ufw deny 10252/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10252 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10252 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10252' -Direction Inbound -Protocol TCP -LocalPort 10252 -Action Block
ufw
sudo ufw deny 10252/udp
iptables
sudo iptables -A INPUT -p udp --dport 10252 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10252 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10252' -Direction Inbound -Protocol UDP -LocalPort 10252 -Action Block

Related ports

10200trisoap10201rsms, rscs10253eapol-relay10260axis-wimp-port

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