HTTPfy

Port 624 (cryptoadmin)

IANA assigns port 624 to cryptoadmin: Crypto Admin.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
cryptoadmin TCP Crypto Admin Tony Walker -
cryptoadmin UDP Crypto Admin Tony Walker -

Check what is listening on port 624

Linux: is anything listening on TCP 624?
sudo ss -tlnp 'sport = :624'
Linux: UDP 624
sudo ss -ulnp 'sport = :624'
Linux / macOS: which process owns the port
sudo lsof -nP -i :624
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':624 '
Windows (Command Prompt)
netstat -ano | findstr :624
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 624 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 624
From Windows
Test-NetConnection HOST -Port 624
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 624

Block port 624 in the firewall

ufw
sudo ufw deny 624/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 624 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 624 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 624' -Direction Inbound -Protocol TCP -LocalPort 624 -Action Block
ufw
sudo ufw deny 624/udp
iptables
sudo iptables -A INPUT -p udp --dport 624 -j DROP
nftables
sudo nft add rule inet filter input udp dport 624 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 624' -Direction Inbound -Protocol UDP -LocalPort 624 -Action Block

Related ports

622collaborator623oob-ws-http, asf-rmcp625dec-dlm, dec_dlm626asia

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