Registration data goes stale fast. WHOIS on ILSERBY asks the registries that currently answer for that domain or IP block, so you see up-to-date registrar, expiry, status, and name-server fields when they are public.
If a registry’s modern lookup is unavailable for a domain, the tool can still fall back to classic WHOIS so you are not left empty-handed.
IP Lookup pairs the same registration view with reverse DNS, location, and ASN — useful when you need to know who runs a network.