HTTPfy

Port 913 (apex-edge)

IANA assigns port 913 to apex-edge: APEX endpoint-relay service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
apex-edge TCP APEX endpoint-relay service - RFC 3340
apex-edge UDP APEX endpoint-relay service - RFC 3340

Check what is listening on port 913

Linux: is anything listening on TCP 913?
sudo ss -tlnp 'sport = :913'
Linux: UDP 913
sudo ss -ulnp 'sport = :913'
Linux / macOS: which process owns the port
sudo lsof -nP -i :913
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':913 '
Windows (Command Prompt)
netstat -ano | findstr :913
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 913 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 913
From Windows
Test-NetConnection HOST -Port 913
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 913

Block port 913 in the firewall

ufw
sudo ufw deny 913/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 913 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 913 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 913' -Direction Inbound -Protocol TCP -LocalPort 913 -Action Block
ufw
sudo ufw deny 913/udp
iptables
sudo iptables -A INPUT -p udp --dport 913 -j DROP
nftables
sudo nft add rule inet filter input udp dport 913 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 913' -Direction Inbound -Protocol UDP -LocalPort 913 -Action Block

Related ports

911xact-backup912apex-mesh914rift-lies915rift-ties

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