Question 1

What is WHOIS and RDAP?

Accepted Answer

WHOIS and its modern successor RDAP (Registration Data Access Protocol) query public domain and IP registries to reveal owner entities, registration dates, expiration periods, and nameservers.

Question 2

Why is some WHOIS contact information hidden?

Accepted Answer

Due to data privacy regulations (such as GDPR in Europe and LGPD in Brazil), personal emails and phone numbers are redacted by registrar privacy protection services.

Question 3

How do I find the ISP managing an IP address?

Accepted Answer

A WHOIS IP query returns the organization holding the IP block (e.g. NIC.br, ARIN, RIPE, LACNIC) along with their Autonomous System Number (ASN).

Question 4

What should I do if a domain is expiring soon?

Accepted Answer

If the WHOIS shows an upcoming expiration date, renew it immediately with your domain registrar to prevent website and email service downtime.

WHOIS / RDAP