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Port 915 (rift-ties)

IANA assigns port 915 to rift-ties: Routing in Fat Trees Topology Information Element.

Well-known (system) port, 0-1023 UDP

Port 915 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
rift-ties UDP Routing in Fat Trees Topology Information Element IESG RFC 9692

Registry dates for this port: registered 2023-02-17, last modified 2024-06-07.

Check what is listening on port 915

Linux: UDP 915
sudo ss -ulnp 'sport = :915'
Linux / macOS: which process owns the port
sudo lsof -nP -i :915
Windows (Command Prompt)
netstat -ano | findstr :915
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 915

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 915

Block port 915 in the firewall

ufw
sudo ufw deny 915/udp
iptables
sudo iptables -A INPUT -p udp --dport 915 -j DROP
nftables
sudo nft add rule inet filter input udp dport 915 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 915' -Direction Inbound -Protocol UDP -LocalPort 915 -Action Block

Related ports

913apex-edge914rift-lies953rndc989FTPS (implicit, data)

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