ASN Lookup
Use ASN Lookup on AboveTool to parse URLs, headers, DNS/WHOIS text, IPs, and certificates in your browser — free, private, no signup.
ASN Lookup
extracts ASN and org fields from pasted whois/BGP or API JSON text
Runs in your browser. Live DNS/WHOIS registries are not queried unless a mode explicitly uses a public lookup API.
About ASN Lookup
ASN Lookup extracts ASN and org fields from pasted whois/BGP or API JSON text. It works by matches AS#### patterns and common org/network labels. Paste output from whois -h whois.radb.net or similar. ASN Lookup runs free in your browser at abovetool.com — no signup, instant results.
How to use
- Enter the inputs for this network utility (two IPs, a single address, headers, PEM, and so on).
- Click Compare IPs, Lookup, Convert, or Run depending on the tool.
- Review the on-page result (including bit diffs or maps where shown), then copy or download.
Features
- Mode-specific forms for headers, URLs, IPs, DNS, and certificates
- Client-side parsers and builders — no upload required
- Copy or download results instantly
- Unique tool copy with practical tips for each utility
Frequently asked questions
What is ASN Lookup for?
ASN Lookup is extracts ASN and org fields from pasted whois/BGP or API JSON text.
How does ASN Lookup calculate the result?
It calculates matches AS#### patterns and common org/network labels.
Any tips for using this calculator?
Paste output from whois -h whois.radb.net or similar.
Is ASN Lookup free on AboveTool?
Yes. ASN Lookup is free to use on abovetool.com with no account required, and results are calculated instantly in your browser.