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ASN Lookup (DNS Based)

This tool finds ASN + AS Name from an IPv4 address using DNS TXT lookup (Team Cymru).
✅ Works on shared hosting without external HTTPS APIs.

Source: Team Cymru DNS IPv4 Only

IP Address

216.73.216.216

ASN

AS16509

AS Name

AMAZON-02 - Amazon.com, Inc., US

Prefix (CIDR Block for this IP)

216.73.216.0/22

Country / Registry

US • arin

Allocated Date

2024-03-26

⚠️ Note: DNS method gives ASN and the prefix of this IP. Full “all prefixes under ASN” requires BGP database or external API/VPS.

About ASN Lookup

ASN Lookup helps you find Autonomous System (AS) information for an IP address or ASN number. An Autonomous System is a large network or group of networks managed by an organization like an ISP, cloud provider, or enterprise company. Each AS has a unique number called ASN, used for internet routing through BGP (Border Gateway Protocol).

What You Can Discover

  • ASN number and name of the network operator
  • ISP/Organization information and routing owner
  • Country/region hint of the ASN
  • Useful details for troubleshooting routing issues

How to Use

  1. Enter an IP address or ASN (example: AS15169)
  2. Click Lookup
  3. Review the ASN owner and routing details

FAQ

Why ASN matters for troubleshooting?
ASN helps identify which network controls the route. This is useful if your traffic gets blocked or routed incorrectly.

Is ASN the same as ISP?
Not always. Some companies have multiple ASNs and routing networks under different names.

📘 Quick Guides
What is an IP address?
An IP is a network identity used for routing traffic. Lookup helps detect ISP, ASN and region.
Why DNS matters?
DNS records control your website and email routes. Wrong records can break access instantly.
CIDR & Subnet basics
CIDR defines IP blocks like /24. Subnet tools help calculate range and usable hosts.