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Bulk up to 100 • A/AAAA + Reverse DNS • No external APIs

IP Address Lookup (Basic)

Paste IPs, domains, or URLs — we’ll resolve A/AAAA records and run reverse DNS for IPs.

Paste up to 100 IPs/domains/URLs (one per line)
Tip: “Basic” means no geo / ASN. It’s a fast DNS + reverse lookup only.

Results

Input Lookup Type Public Reverse Issues
Run a lookup to see results here.
Reverse DNS depends on PTR records. Many IPs have none.

Quick interpretation

IP lookups help debug DNS, hosting, and redirects.

  • OK resolved successfully (or valid IP)
  • Warning no records, private/reserved IP, no reverse DNS
  • Error invalid input / host
DNS basics

IP address lookup: resolve domains and verify reverse DNS

When a website “moves” or breaks, DNS is often the reason. This tool resolves A (IPv4) and AAAA (IPv6) records and checks reverse DNS for IPs.

What this basic tool does

  • Domain → IP: shows A/AAAA answers (if present).
  • IP → hostname: reverse DNS (PTR) lookup.
  • Flags: invalid input, private/reserved IPs, missing records.

FAQ

What inputs can I paste into this IP lookup tool?

You can paste IPv4, IPv6, a domain, or a full URL. If you paste a URL, we extract the hostname and resolve it. If you paste an IP, we skip DNS resolution and run reverse DNS (PTR) instead.

Each line can contain extra spaces — the tool splits by whitespace and removes duplicates (case-insensitive).

Why does the tool say “no A/AAAA records”?

That means DNS did not return any A (IPv4) or AAAA (IPv6) answers for the host. Common reasons:

  • the hostname is wrong (typo, missing subdomain)
  • the domain exists but the specific host has no A/AAAA (only CNAME/MX/etc.)
  • DNS is misconfigured or temporarily failing

This tool only reports A/AAAA in “Basic” mode, so it won’t show CNAME chains or MX records.

Why is reverse DNS empty for an IP?

Reverse DNS requires a PTR record, usually managed by the ISP or hosting provider that owns the IP range. Many IPs simply have no PTR, so reverse lookup returns nothing.

Also, some networks intentionally omit PTRs or return generic hostnames. This is normal and not always a problem.

What does “Public: no” mean?

“Public: no” means the IP is not publicly routable (private, reserved, or special-use). Examples include local network ranges (like 192.168.x.x) and localhost (127.0.0.1, ::1).

If you expected a public IP but got a private one, it often indicates an internal DNS override, VPN split-DNS, or a mis-typed input.

Why do I see IPv4 but no IPv6 (or the other way around)?

Domains can publish A records, AAAA records, both, or neither. Many sites still run IPv4-only. Some are IPv6-enabled but do not guarantee IPv6 everywhere.

If you only see AAAA, your network may still reach the site through IPv6, but some clients without IPv6 connectivity can have issues.

Does this tool show geolocation, ASN, ISP, or hosting provider?

No. This is IP Address Lookup (Basic), which means it uses only server-side DNS resolution and reverse DNS. There are no external geo/ASN APIs here.

If you need ASN/ISP/geo, that’s a different tool category (and usually requires external data sources).

Why can results differ from what I get on my local machine?

DNS answers can vary by resolver, region, and time (CDN routing, geo DNS, load balancing). Your computer might use a different DNS resolver than the shared hosting server running this tool.

If you’re debugging a DNS problem, run the lookup from multiple networks and compare results.

How reliable is the tool for bulk checks on shared hosting?

It’s designed to be lightweight: up to 100 inputs per run, using built-in PHP DNS functions. There’s no heavy crawling and no external API latency.

That said, DNS can time out or return empty results under load. If you see inconsistent responses, rerun the same list and compare. Export CSV to keep your snapshots.