ASN lookup: which network owns this IP?
Find the autonomous system — the network — that routes an IP address, with its operator name and address block.
- AS number and operator
- The routed block the address belongs to
- Hosting and cloud classification
Give it something to look up — Glee will do the digging.
How the asn lookup works
The internet is a network of networks, and each one that routes its own addresses has an autonomous system number (ASN). Knowing the ASN behind an address answers questions a city never will: is this traffic from a residential provider, a mobile carrier, a university or a cloud platform? Abuse teams block by ASN, and analysts group visitors by it.
Enter an IP address and we return the AS number and operator name announcing it, the network block it falls in, and the classification we hold for that network. The data comes from public internet routing information compiled into our database and refreshed daily.
Lookup by AS number — listing every block a network announces — is not offered yet; this page answers the more common question, "whose network is this address on?".
What each field means
- ASN
- The autonomous system number announcing the address.
- Network operator
- The name the network registered, usually a company.
- Network
- The address block the route covers.
Where this check stops
- Do not read the network operator as the owner of a website or company on the address: hosting providers announce their customers' addresses.
- A block can be announced by a different network tomorrow; the data date is shown.
The same check, through the API
Same calculation, same answer, with a key. 1 credit per check ($0.10 per 1,000). A free account includes 1,000 credits a month.
GET /v1/ip/1.1.1.1 Host: gleanzy.com Authorization: Bearer $GLEANZY_KEY
Frequently asked
Can I enter an AS number?
Not yet. Enter any IP address from the network instead.
Is the operator the same as the ISP?
For home and mobile connections usually yes; for servers it is the hosting or cloud company.