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BGP and ASN Data

ASN Prefix Explorer

Explore announced prefixes for an ASN, split them by IPv4 and IPv6, and get a fast operational view of how large the routed footprint looks.

Announced Prefix View

Pulls a usable list of announced prefixes for the ASN.

IPv4 / IPv6 Split

Separates families and shows how much of each is being announced.

Operator Context

Useful for peering reviews, troubleshooting, route hygiene, and infra research.

Examples

This tool queries announced prefix data and ASN whois-style details, then summarizes them for routing and planning workflows.

Enter an ASN to load announced prefixes and summary data.

Why this matters

ASN prefix visibility is useful for peering, incident response, asset inventory, and understanding a network’s routed footprint.

What it is not

This is a routing-data summary, not a live BGP control plane monitor. Propagation and policy can still vary by vantage point.

Operational payoff

A clean ASN prefix explorer helps compare providers, validate expected announcements, and document address ownership quickly.

About This Tool

The ASN Prefix Explorer turns announced-prefix data into a simple working view for engineers who need to understand what an autonomous system is routing. It loads ASN metadata, summarizes IPv4 versus IPv6 footprint, highlights the largest prefixes, and provides a searchable prefix list. This is useful during peering reviews, abuse investigations, route leak response, asset inventory work, and provider evaluation where ASN-level routing scope matters. It also makes a strong landing page for SEO around ASN prefixes, announced networks, BGP footprint, and AS routing size.

How to Use

  1. Enter the ASN number without the AS prefix.
  2. Load the data and review the summary cards first.
  3. Inspect IPv4 and IPv6 prefix counts and the largest announced blocks.
  4. Use the family and search filters to narrow the prefix list.

Features

  • Loads announced prefix data for an ASN
  • Summarizes IPv4 and IPv6 counts separately
  • Shows largest announced prefixes and simple address totals
  • Supports list filtering by family and prefix text
  • Designed as both a tool and an SEO-friendly landing page

Common Use Cases

  • Reviewing provider routing footprint
  • Validating expected address announcements
  • Documenting an ASN during incident response
  • Comparing IPv4 and IPv6 deployment maturity

Technical Details

Announced-prefix data reflects what a network originates into routing, but it is still a summary view rather than a complete real-time BGP perspective.

This page groups prefixes by family, counts unique entries, and estimates address quantities from prefix length. It is most useful as a planning, documentation, and quick-research tool.

ASN Prefix FAQ

Does this show every path the ASN can reach?

No. It shows announced origin prefixes associated with the ASN, not every transit path or routing policy outcome.

Why can prefix counts differ from another source?

BGP data depends on collection point, timing, deduplication, and the upstream data source, so small differences are normal.

Can one ASN announce both IPv4 and IPv6?

Yes. Many networks originate both families, and the split often reflects deployment maturity or service footprint.

Does a larger prefix count always mean a bigger network?

Not always. Prefix granularity, traffic engineering, deaggregation, and address family mix all affect the count.