A link in an email looks slightly wrong, or a domain shows up in a phishing report. You can learn a lot about it without ever visiting the page. These checks work best together, because a domain that looks odd on one point is often fine, while one that looks odd on three is worth blocking.
1. Check when it was registered
Registration data (RDAP or WHOIS) shows the creation date. Domains used for phishing and malware are often days or weeks old. A brand that has existed for a decade does not usually have a domain registered last Tuesday. Also look at the registrar and whether contact details are hidden, although privacy services are common on legitimate sites too.
2. Read the DNS records
The A and AAAA records show where the site is hosted, and the MX, NS and TXT records show mail and infrastructure choices. A domain with no mail records that suddenly sends email, or one that shares an address with many other flagged domains, deserves a closer look.
3. Inspect the TLS certificate
Almost every site has a certificate now, including malicious ones, so its presence proves nothing. What helps is the details: a certificate issued a few hours ago for a domain that imitates a well-known name, or one that lists many unrelated hostnames, is a common phishing pattern.
4. Look at the HTTP response
Response headers show the server software, where redirects lead, and whether basic protections such as HSTS and a content security policy are present. A short redirect chain that ends on a login form for a different brand is a strong sign.
5. Check the reports
See whether others have already flagged it. Our domain watch lists domains reported by the security community, and each entry links to related reports from the same day or with the same tags. Community reports are quick but unverified, so treat them as a lead rather than a verdict.
Putting it together
The IP and domain lookup gathers the DNS, registration, certificate, header and blocklist data for a domain on one page. If several of these checks look wrong, block the domain and report it. If they look ordinary, wait and check again later, since a new phishing site can look clean for its first few hours.