ASN, ISP and Reverse DNS: What Each Field Means
A short reference explaining the network ownership fields you see in any IP lookup: ASN, ISP, organization, and reverse DNS.
When you look up an IP, you usually see fields about who owns and operates the network. These are administrative records, not personal data.
ASN (Autonomous System Number)
An ASN identifies a group of IP networks under a single routing policy — usually an ISP, cloud provider, university, or large company.
ISP
The Internet Service Provider that allocates the address to the end network. For mobile traffic this is the carrier, for home internet it is the broadband provider.
Reverse DNS (PTR)
A hostname associated with the IP. ISPs often use generic templates such as host-203-0-113-10.example-isp.net.
Tanya Jawab (FAQ)
Is ASN the same as ISP?
They are closely related but not identical. One ISP can own multiple ASNs, and ASN names are sometimes more technical than the public brand.
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