ASN Number Lookup Tool

ASN Lookup is the abbreviation of Autonomous System Number Lookup. This is an online search and information search engine for autonomous system numbers (ASNs). ASN is assigned to a collection of IP addresses managed by a single network operator, such as an internet service provider (ISP) or the internal network of a company.

With ASN Lookup, users can enter either an IP address or an ASN and retrieve information about the network associated with that address or number. The information usually provided includes the name of the network operator, the location, the routing information, and other relevant details. ASN Lookup can be used for a variety of purposes, such as identifying the internet service provider of a particular IP address, checking routing information to troubleshoot connectivity issues, and monitoring network security by identifying potential risks or vulnerabilities.

• AS15169: Assigned to Google LLC for its global network infrastructure.
• AS16509: Belongs to Amazon.com, Inc., used for Amazon Web Services (AWS).
• AS13335: Allocated to Cloudflare, Inc. for its content delivery and security services.
• AS7018: Owned by AT&T Services, Inc., used for AT&T's backbone network in the USA.
• AS7922: Comcast Cable Communications, LLC, for Comcast's ISP services in the USA.
• AS3356: Assigned to Level 3 Parent, LLC, part of CenturyLink's global network.
• AS12389: Allocated to PJSC Rostelecom, a major Russian telecommunications company.
• AS714: Belongs to Apple Inc., used for Apple's internal network and services.
• AS8075: Microsoft Corporation, for Microsoft's global network including Azure and Office 365.
• AS32934: Assigned to Facebook, Inc., for its global network infrastructure.

Public ASNs

• Globally Unique ASNs: Used in networks that require a globally unique ASN for BGP routing. Assigned by regional internet registries and unique across the entire internet.
• Public but Not Globally Unique ASNs: Unique within a certain region but may not be globally unique. Used in specific situations where global uniqueness is not necessary.

Private ASNs

• Private ASNs: Reserved for use in private networks, not meant to be visible on the public internet. The range for 16-bit private ASNs is 64512 to 65534, and for 32-bit ASNs, it is 4200000000 to 4294967294.

Regional Internet Registries (RIRs)

The allocation and management of ASNs are governed by five RIRs:

• AFRINIC (Africa)
• APNIC (Asia-Pacific)
• ARIN (North America)
• LACNIC (Latin America and the Caribbean)
• RIPE NCC (Europe, the Middle East, and parts of Central Asia)