Quick answer
ASN stands for Autonomous System Number. In an IP lookup, it shows which network or organization is announcing that IP block, which helps explain whether the address belongs to an ISP, carrier, datacenter, or VPN.
What an ASN tells you
An ASN is not a personal identifier. It is a network label used to route internet traffic and show which organization is responsible for a range of IP addresses.
In practice, it helps you understand the type of network behind an IP, which is useful when you are comparing normal home traffic, mobile traffic, a VPN, or a datacenter connection.
Why it appears in IP tools
ISP or carrier
Often means the IP belongs to a residential internet provider or mobile network.
Datacenter
Many VPN servers and hosted services use datacenter networks, which can affect location and trust signals.
Mobile carrier
Mobile ASNs often route many users through shared gateways, which can affect IP location accuracy.
VPN network
VPNs may use ASNs that clearly differ from your normal ISP, which is one reason they are easy to spot.
How ASN helps with location confusion
If a city looks wrong, the ASN can tell you whether the IP is coming from a residential ISP, a carrier gateway, or a datacenter. That does not give an exact location, but it gives useful context for interpreting the result.
Check the live IP result
Use the live tool to see your IP, approximate location, and network context, then compare it with the VPN and WebRTC tests.
Frequently asked questions
Is ASN the same as ISP?
Not exactly. An ASN identifies the routed network, while the ISP is the provider or organization behind it. They are often related.
Does ASN reveal my exact location?
No. It helps describe the network, not your street address.