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This article lists the available filters for Autonomous System Number (ASN) assets in Microsoft Defender External Attack Surface Management. Each filter entry describes the filter's purpose, expected value format, and supported operators. Use these filters to refine your Defender EASM inventory searches and locate a specific ASN or group of ASNs.
Freeform filters
These filters require you to type the search value yourself. The list is sorted by the number of operators each filter supports, then by name.
| Filter name | Description | Value format | Applicable operators |
|---|---|---|---|
| ASN | Autonomous System Number is a network identification for transporting data on the Internet between Internet routers. An ASN associates any public IP blocks tied to it where hosts are located. | 12345 | Equals Not Equals In Not In Empty Not Empty |
| Whois Admin Email | The email address of the listed administrator of a Whois record. | name@domain.com | Equals Not Equals Starts with Does not start with Matches Does Not Match In Not in Starts with in Does not start with in Matches in Does not match in Contains Does Not Contain Contains In Does Not Contain In Empty Not Empty |
| Whois Admin Name | The name of the listed administrator. | John Smith | |
| Whois Admin Organization | The organization associated with the administrator. | Contoso Ltd. | |
| Whois Email | The primary contact email in a Whois record. | name@domain.com | |
| Whois Registrant Email | The email address of the listed registrant. | name@domain.com | |
| Whois Registrant Name | The name of the listed registrant. | John Smith | |
| Whois Registrant Organization | An organization associated with the listed registrant. | Contoso Ltd. | |
| Whois Technical Email | The email address of the listed technical contact. | name@domain.com | |
| Whois Technical Name | The name of the listed technical contact. | John Smith | |
| Whois Technical Organization | The organization associated to the listed technical contact. | Contoso Ltd. |