!scan-headers-ip4 performs a live probe of Internet services running on an IPv4 host and retrieves their headers and banners. This allows you to inspect how a service identifies itself, what metadata it returns, and whether it exposes diagnostic information useful for troubleshooting.

Service headers often reveal details such as software versions, supported protocol features, redirection behavior, or security capabilities. By examining these responses, you gain insight into how a remote host is configured and how it communicates with clients across the Internet.

This command performs a real‑time probe and, in keeping with good Internet citizenship, may transmit your public IP address to the target service.

You may also use !scan-headers in place of !scan-headers-ip4

!scan-headers-ip4 commands have the following structure

!scan-headers-ip4
  <IPv4_Address>(:)<Port_Number>
  (<Transport_Protocol>) [TCP|UDP --default: TCP]
  (<App_Protocol>) [None|HTTP|SMTP|IMAP --default: None]


Usage:
!scan-headers-ip4 <ipv4-address> <port> [tcp|udp] [none|http|smtp|imap]

Usage Examples:
!scan-headers 5.196.102.158:80
!scan-headers 188.165.32.16 80 tcp
!scan-headers 188.165.32.16 80 tcp http
!scan-headers 37.59.79.237:80 tcp
!scan-headers 37.59.79.237:80 tcp http
!scan-headers-ip4 1.1.1.1 80 tcp http
!scan-headers-ip4 13.107.21.200:80
!scan-headers-ip4 13.107.21.200:80 tcp http
!scan-headers-ip4 39.156.66.10 80 tcp http
!scan-headers-ip4 108.177.127.26:25 tcp smtp
!scan-headers-ip4 108.177.127.26:25 tcp
!scan-headers-ip4 8.8.8.8:443
!scan-headers-ip4 9.9.9.9:443 tcp
!scan-headers-ip4 9.9.9.9:443 tcp
!scan-headers 8.8.4.4:53 udp
!scan-headers 8.8.4.4 443
!scan-headers-ip4 151.101.1.69:443 tcp http
!scan-headers-ip4 45.33.32.156:22 tcp


See also:
!help !scan
!help !scan-headers


Note:
To probe Internet daemons that use TLS/SSL see !help !ssl

To test for connectivity Services that use SCTP see !scan-port-ip4