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developer Utility Updated: Current (IPv4/IPv6 BGP & RDAP Standards)

Reverse DNS & IP Geolocation Studio

Auto-detect client IP, perform reverse PTR lookup, inspect Autonomous System (ASN) routes, organization, geographic coordinates, and real-time round-trip latency telemetry.

#Networking#IPLookup#ReverseDNS#ASN#Geolocation
Quick Samples:
Hardware-accelerated PTR reverse lookup & ASN routing
IPv4 Address

8.8.8.8

Round-Trip Latency24ms
Reverse DNS (PTR Record)
dns.google
Autonomous System (ASN)
ASN Number:AS15169
Organization:GOOGLE
IP Prefix Route:8.8.8.0/24
Geographic Location
Country:United States (US)
City / Region:Mountain View, California
Coordinates:37.4056, -122.0775
Timezone:America/Los_Angeles
ISP & Carrier Identity
ISP Name:Google LLC
Organization:Google Public DNS
Proxy / Threat Check:Clean Residential / Direct
Raw IP Telemetry JSON
{
  "query": "8.8.8.8",
  "ip": "8.8.8.8",
  "version": "IPv4",
  "isClientIp": false,
  "reverseDns": [
    "dns.google"
  ],
  "asn": {
    "number": 15169,
    "org": "GOOGLE",
    "route": "8.8.8.0/24"
  },
  "geo": {
    "country": "United States",
    "countryCode": "US",
    "region": "California",
    "city": "Mountain View",
    "latitude": 37.4056,
    "longitude": -122.0775,
    "timezone": "America/Los_Angeles",
    "continent": "North America"
  },
  "isp": "Google LLC",
  "organization": "Google Public DNS",
  "latencyMs": 24,
  "threatLevel": "clean"
}

Network Telemetry & Geolocation Privacy Notice

IP geolocation coordinates and ASN routing data are queried from regional internet registries (ARIN, RIPE, APNIC). Exact physical device coordinates are never captured or logged.

Technical & Statutory Standard: PTR reverse DNS resolution utilizes standard in-addr.arpa and ip6.arpa DNS queries.

Comprehensive Technical Guide & Reference

3 Topics

Auto-detect your public IP address or look up any IPv4/IPv6 host to inspect PTR hostname pointers, ASN autonomous system classification, ISP details, and geographic coordinates.

11. Step-by-Step: How to Perform Reverse DNS Lookups

Query IP routing and origin information in three simple steps:

  • •Auto-Detect or Input IP: View your detected client IPv4/IPv6 address or enter any external IP address / hostname.
  • •Inspect PTR Hostname: Resolve the authoritative pointer record (`PTR`) registered in the ARPA reverse zone.
  • •Review Autonomous System (ASN): Inspect BGP routing numbers (e.g. `AS15169 Google LLC`), organization names, and CIDR blocks.
  • •View Geographic Telemetry: Review estimated city, country, postal zone, and round-trip ping latency.

22. Technical Explanation: What is Reverse DNS (PTR)?

While forward DNS maps hostnames to IP addresses (`example.com` -> `93.184.216.34`), Reverse DNS maps an IP address back to its verified domain hostname via special PTR records in `in-addr.arpa` (for IPv4) and `ip6.arpa` (for IPv6):

  • •IPv4 Inversion: An IP like `1.2.3.4` is queried as `4.3.2.1.in-addr.arpa`.
  • •Mail Server Verification: Major email receivers reject incoming SMTP connections from IP addresses lacking matching forward-confirmed reverse DNS (FCrDNS).
  • •BGP & Autonomous Systems: The Internet is divided into Autonomous Systems (ASNs) managed by ISPs and hyperscalers (Amazon, Cloudflare, Microsoft).

33. Enterprise Security & Anti-Fraud Use Cases

Reverse DNS and ASN inspection helps security engineers detect VPN proxies, Tor exit nodes, and automated bot scrapers during fraud risk scoring.

Frequently Asked Questions

Many email providers reject incoming SMTP connections from IP addresses whose PTR records do not match their forward DNS hostname, using it as an anti-spam verification step.

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