ipDestination and service
An IP helps reach a network destination, while a TCP or UDP port distinguishes a communication endpoint there. One server can provide multiple services on the same IP. An IP lookup alone therefore does not show which applications are running or reachable.
Common numbers are clues
Port 443 is commonly used for HTTPS, but a number alone does not prove the service type or its security. When writing an IPv6 address with a port, brackets are commonly used: [2001:db8::1]:443. Remove the port and brackets when a lookup field expects only an IP.
Scope in access control
When publishing your own service, allow only the ports and sources needed. TCP and UDP may require separate rules even when they use the same number. Geolocation does not verify port access; test the application connection in an authorized environment. Do not scan unfamiliar networks without permission.
Lookup is not a service test
Finding country and provider information does not prove that an IP serves HTTPS. When testing your own server, separate DNS, IP reachability, TCP connection, and application response. An open port 443 does not establish a correct certificate or expected website content. Verify the application-level result as well.
Further reading
Transport port numbers — RFC 6335 ↗Put it into practice
Inspect one public IP, or compare a list of addresses with the bulk lookup tool. Location results are approximate.
Single lookup ↗ Bulk lookup ↗