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Port 10253 (eapol-relay)

IANA assigns port 10253 to eapol-relay: Relay of EAPOL frames.

Registered (user) port, 1024-49151 UDP

Port 10253 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
eapol-relay UDP Relay of EAPOL frames Wi-SUN Alliance -

Registry dates for this port: registered 2015-06-26.

Check what is listening on port 10253

Linux: UDP 10253
sudo ss -ulnp 'sport = :10253'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10253
Windows (Command Prompt)
netstat -ano | findstr :10253
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 10253

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10253

Block port 10253 in the firewall

ufw
sudo ufw deny 10253/udp
iptables
sudo iptables -A INPUT -p udp --dport 10253 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10253' -Direction Inbound -Protocol UDP -LocalPort 10253 -Action Block

Related ports

10201rsms, rscs10252apollo-relay10260axis-wimp-port10261tile-ml

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