What Is My ASN
Your ASN
Detecting…
ASN identifies the network that announces your public IP. VPN exit nodes show the VPN provider's ASN.
How to use
- Open the page — your ASN is resolved from your public IP automatically.
- Read the AS number, network name, ISP, and organization in the details panel below.
- Click Copy to save the full ASN string (for example AS15169 Google LLC) for a ticket or audit.
FAQ
What is my ASN?
Your ASN (Autonomous System Number) identifies the network that announces your public IP on the internet — for example AS15169 for Google or AS7922 for Comcast. It appears at the top of this page as AS number plus registered network name.
What is an Autonomous System?
An Autonomous System (AS) is a collection of IP prefixes operated by one organization and announced via BGP routing. The ASN is the unique numeric label (ASxxxx) assigned by regional internet registries like ARIN, RIPE, or APNIC.
Why does my ASN matter?
Network engineers, CDNs, security teams, and abuse desks use ASN to apply routing policies, geo-fencing, rate limits, and threat intelligence. It tells you which organization operates the IP block you are currently on.
Why does a VPN change my ASN?
A VPN exit node belongs to the VPN provider's AS, not your home ISP's. Connecting to a VPN replaces your ASN with the provider's — refresh this page before and after connecting to compare.
Is ASN the same as ISP?
Related but not identical. Your ISP is the consumer-facing provider name; your ASN is the routing identifier for their network. Large companies may operate multiple ASNs; hosting providers often share one ASN across many customers.
How is ASN detected?
The page reads your public IP from this connection, then looks up the announcing AS from public geo and routing databases — the same data sources used by IP address lookup tools.
Introduction
What Is My ASN shows the Autonomous System Number and registered network name for your current public IP, front and center with a one-click copy button. Below it, a details panel breaks out the AS number, network name, ISP, organization, and public IP so you can paste a complete network identity into a ticket or audit log.
ASN is the routing-level identifier behind every public IP — less familiar than an ISP name, but essential for network engineers, security analysts, and anyone configuring CDN or firewall rules by autonomous system. Finding yours should not require WHOIS lookups — this page resolves it from your live connection.
What is an ASN?
An Autonomous System Number (ASN) is a unique identifier assigned to a network that participates in BGP (Border Gateway Protocol) routing on the internet. Each ASN represents one organization's routing domain:
| ASN | Network name | Type |
|---|---|---|
| AS15169 | Google LLC | Cloud / content |
| AS7922 | Comcast Cable Communications | Residential ISP |
| AS13335 | Cloudflare, Inc. | CDN / DNS |
| AS16509 | Amazon.com, Inc. | Cloud hosting |
When you browse the internet, your public IP belongs to an IP prefix announced by one of these autonomous systems. The ASN tells you which network operator that is.
ASN vs ISP vs organization
- ASN — the numeric routing ID (
AS15169) plus registered network name; used in BGP and peering. - ISP — the consumer-facing brand you pay for internet (may differ from the legal entity on the ASN).
- Organization — the legal registrant of the IP block in WHOIS data; often matches the ASN holder.
All three appear in the details panel so you can use whichever label your workflow requires.
Common use cases
- Firewall and CDN rules — whitelist or block traffic by AS number instead of individual IPs.
- Security investigations — identify which network announced a suspicious connection.
- VPN verification — confirm your ASN switched to the VPN provider after connecting.
- Compliance and audits — document the upstream network for a remote endpoint.
Best practices
- Copy the full ASN string (number plus name) —
AS15169alone is less useful in tickets thanAS15169 Google LLC. - ASN reflects your current public IP — it changes when you switch networks, VPN servers, or mobile data.
- For the consumer provider name rather than the routing ID, see what is my ISP; for the raw address, see what is my IP.
- To look up the ASN of any IP you paste in, use IP address lookup.