// REFERENCE
Port 500 (IKE / IPsec)
Protocol: UDP
Service: IKE
Medium risk
IKE: key negotiation for IPsec VPNs. Seeing it open indicates a VPN gateway. Weak setups (IKEv1 aggressive mode with PSK) allow offline key cracking; use IKEv2.
Related tools
Work with this in:
Related
22
Port 22 (SSH) 23
Port 23 (Telnet) 1194
Port 1194 (OpenVPN) 1723
Port 1723 (PPTP VPN) 2222
Port 2222 (alternate SSH) 3389
Port 3389 (RDP)
Port 22 (SSH) 23
Port 23 (Telnet) 1194
Port 1194 (OpenVPN) 1723
Port 1723 (PPTP VPN) 2222
Port 2222 (alternate SSH) 3389
Port 3389 (RDP)
Assignments per the IANA port registry. Educational content.