Network Overview
| ASN | AS1257 |
| Organization | Tele2 Sverige AB |
| Announced IPv4 ranges | 253 |
| Total IPv4 addresses | 6,458,880 |
Sample IP Ranges Announced by AS1257
| Range Start | Range End | Lookup |
|---|---|---|
5.240.0.0 |
5.243.255.255 |
Details → |
31.15.32.0 |
31.15.63.255 |
Details → |
37.0.128.0 |
37.0.255.255 |
Details → |
37.2.0.0 |
37.3.255.255 |
Details → |
37.196.0.0 |
37.199.255.255 |
Details → |
37.233.64.0 |
37.233.79.255 |
Details → |
What Is an Autonomous System?
An autonomous system (AS) is a collection of IP networks operated by a single organization - an ISP, cloud provider, enterprise, or university - that shares a common routing policy. Each AS is identified by a unique AS number (ASN) and exchanges routing information with other systems using the BGP protocol.
Knowing which ASN an IP belongs to reveals who actually operates the network behind it - useful for fraud analysis, traffic quality assessment, and abuse investigation. Use the IP lookup tool to find the ASN for any address.
Frequently Asked Questions
What is AS1257?
AS1257 is the autonomous system operated by Tele2 Sverige AB, announcing 253 IPv4 ranges (6,458,880 addresses).
Who operates AS1257?
Tele2 Sverige AB. An autonomous system is a network under a single administrative entity that exchanges routes with other networks via BGP.
How do I check if an IP belongs to AS1257?
Enter the IP into our free IP lookup - the result shows the ASN, operator, geolocation, and VPN/datacenter flags.
How many IP addresses does AS1257 have?
AS1257 currently announces approximately 6,458,880 IPv4 addresses across 253 ranges, according to public routing data.