WHOIS vs RDAP for Domain and IP Investigation
WHOIS remains common for domain registration records, while RDAP gives you structured registry ownership data that often fits IP and ASN investigation better.
Keep the comparison factual: ComUtil's live domain workflow is WHOIS/SSL-oriented, and the live IP workflow already surfaces RDAP and WHOIS-backed registry context. This page explains the boundary instead of promising unsupported full-domain RDAP coverage.
Use this page when
You need to explain why a hostname investigation still starts with WHOIS-style registration facts, while an IP investigation often benefits from structured RDAP ownership data.
ComUtil boundary
Use the live domain workflow for registrar, nameserver, and certificate facts. Use the live IP workflow for ASN, registry, and network-range context.
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Do not imply that ComUtil is a full RDAP replacement for every domain record. Keep the page tied to the live domain and IP workflows that already exist.
Start from a suspicious login domain
WHOIS remains common for registrar, expiration, and nameserver facts when the investigation starts from a hostname.
1. Check a domain
2. Review registrar, expiration, and nameservers
3. Compare certificate timing before you pivot to IP ownership
Start from a source IP or ASN question
RDAP gives you structured registry ownership data when the investigation begins from a public IP, ASN, or provider range.
1. Lookup an IP
2. Compare registry, ASN owner, and network range
3. Escalate with those ownership facts
Use both when the investigation pivots
A domain can lead you into IP ownership, but the two jobs still answer different questions.
Domain facts -> WHOIS/SSL workflow
Infrastructure ownership -> IP workflow
Range scope -> CIDR guide if the question expands
Domain investigations still commonly start with WHOIS-style registrar, expiration, and nameserver data because that is the clearest match for hostname triage.
- Use the domain workflow when the investigation starts from a hostname, login URL, or registrable domain.
- Keep the focus on registrar metadata, nameservers, and certificate timing rather than pretending the page is a full threat-intelligence feed.
RDAP is better suited to machine-readable ownership context, which is why the IP workflow already surfaces structured registry and ASN details with WHOIS fallback where needed.
- Use the IP workflow when the question is who owns this address, which registry allocated it, and what network range it belongs to.
- Treat RDAP as ownership context, not as a maliciousness verdict or a replacement for deeper investigation.
Choose the live page that matches the artifact you actually have, then pivot only when the investigation crosses that boundary.
- Use /domain first for hostname-based questions, then pivot into /ip if the investigation expands into infrastructure ownership.
- Return to the broader workflow when you need the domain -> IP -> CIDR triage order instead of one isolated protocol comparison.