Autonomous System Number (ASN) - ASN is a globally unique identifier that defines a group of one or more IP prefixes run by one or more network operators that maintain a single, clearly-defined routing policy. Network operators need Autonomous System Numbers (ASNs) to control routing within their networks and to exchange routing information with other Internet Service Providers (ISPs). Each Autonomous SystemcNumber is assigned by a Regional Internet Registry (RIR) like ARIN, RIPE NCC, or APNIC.

There are two different formats to represent ASNs: 2-byte and 4-byte.

A 2-byte ASN is a 16-bit number. This format provides for 65,536 ASNs (0 to 65535). From these ASNs, the Internet Assigned Numbers Authority (IANA) reserved 1,023 of them (64512 to 65534) for private use.

A 4-byte ASN is a 32-bit number. This format provides for 232 or 4,294,967,296 ASNs (0 to 4294967295). IANA reserved a block of 94,967,295 ASNs (4200000000 to 4294967294) for private use.

Up until the Internet Engineering Task Force (IETF) proposed a gradual transition to 4-byte ASNs in 2007, all ASNs were 2-byte. There is no longer a distinction between a 2-byte and 4-byte ASN, and all ASNs should be considered 4-byte.

Subfilter includes the following options:

Has value - to find all domain names with ASN record
Greater than - to find all domain names with AS number bigger than a certain value.
Greater or equal to - to find all domain names with AS number bigger than or equal certain value.
Less than - to find all domain names with AS number lesser than a certain value.
Less or equal to - to find all domain names with AS number lesser than or equal certain a certain value.

An Autonomous System Organization (ASO), sometimes referred to as an AS Organization, is the entity responsible for the management and operation of an Autonomous System defined by an Autonomous System Number.

Use the subfilter for the precise search:

Equal to - for a precise search of the known organization name
Contains - when only a part of the organization name is known
Exclude - to exclude certain strings from the search
RegEx (short for Regular expression) - for a string or pattern to be searched for within a longer piece of text
Wildcard - allows for using of asterisk sign " * " instead of unknown characters
Starts with - organization name starts with a certain string
Ends with - organization name ends with a certain string
Has value - to find all domain names with ASO record

GeoIP refers to a technology or service that enables the identification of a geographical location associated with an IP (Internet Protocol) address. It provides information about the country, region, city, latitude, longitude, and other related details for a given IP address.

GeoIP databases are created by collecting and correlating IP address ranges with geographic locations. Various methods and data sources are used to gather this information, including IP allocation records from Regional Internet Registries (RIRs), ISP data, geolocation services, and user-contributed data.

Hosting filter allows users to identify all the websites that are hosted on the servers of a certain provider.

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