Robtex is a free network intelligence platform providing DNS lookups, IP geolocation, ASN analysis, reverse DNS, and WHOIS data. We map relationships between domains, IPs, and networks to reveal infrastructure patterns.

Yes. All lookup tools are free with no registration required. We support our service through non-intrusive advertising.

DNS queries return live, real-time data. Geolocation and network ownership data is updated regularly from regional internet registries.

The website is free for all users. For API access or bulk data needs, contact us about commercial licensing.

Both work identically. IPv6 addresses contain more routing information but return the same categories of data: location, ownership, and DNS records.

IP geolocation is updated regularly from regional internet registries. Accuracy varies - datacenter IPs are highly accurate while mobile and residential IPs may show approximate locations.

Yes. Enter your public IP to see how your network appears to external services and verify your reverse DNS configuration.

Not all IP addresses have PTR records configured. This is common for residential connections and some cloud providers.

Yes. Enter any subdomain like mail.example.com or api.example.com to see its specific DNS records.

DNS records are queried in real-time. You see the current live configuration, not cached historical data.

The domain may not exist, may have expired, or may have no public DNS records configured. Check that you entered the domain correctly.

Current lookup shows live data. For historical DNS analysis, the domain's record history may show previous configurations.

Search by organization name or look up any IP address they control - the results will show the announcing ASN.

A prefix is a block of IP addresses in CIDR notation (e.g., 192.0.2.0/24). ASNs announce prefixes to tell other networks how to route traffic to those addresses.

Yes. Large organizations often operate several ASNs for different business units, geographic regions, or technical purposes.

They're used interchangeably. AS (Autonomous System) is the network itself; ASN (Autonomous System Number) is its identifier.

This indicates shared hosting or a CDN. Many websites can legitimately share infrastructure through hosting providers or content delivery networks.

A PTR (pointer) record is the official reverse DNS entry set by whoever controls the IP address. It's used for mail server verification and network identification.

WHOIS shows IP ownership at the registry level. Reverse DNS shows actual usage - what services and domains actively use that address.

No. If a domain's DNS points to an IP, that relationship is public. There's no way to create a "private" A record.

WHOIS privacy services and GDPR regulations protect personal information. The domain still functions normally; only contact details are masked.

Registrants are required to provide accurate information, but enforcement varies. Registration dates and nameserver data are reliable; contact information may be outdated.

Current WHOIS shows live registration data. Historical WHOIS requires specialized archives that track changes over time.

Codes like "clientTransferProhibited" or "serverHold" indicate domain state. Common statuses reflect normal operations; unusual codes may indicate disputes or policy holds.

We query live DNS, regional internet registries (ARIN, RIPE, APNIC, LACNIC, AFRINIC), and maintain our own passive DNS database for relationship mapping.

We correlate data across millions of domains - which sites share nameservers, IPs, or mail servers. This reveals patterns invisible in single-record lookups.

Yes. Robtex provides an MCP (Model Context Protocol) server for programmatic access. See our MCP documentation for details. --- Can't find your answer? The tools themselves provide context-specific help. Try a lookup and explore the results.