IPv4 AS & ASN Directory
| IP Range | CIDR | ASN | AS Name | |
|---|---|---|---|---|
| 12.255.138.0 to 12.255.139.255 | 12.255.138.0/23 | AS4466 | AT&T Services Inc. | See Range |
| 12.255.140.0 to 12.255.141.255 | 12.255.140.0/23 | AS4466 | AT&T Services Inc. | See Range |
| 12.255.142.0 to 12.255.142.255 | 12.255.142.0/24 | AS4466 | AT&T Services Inc. | See Range |
| 12.255.143.0 to 12.255.143.255 | 12.255.143.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.255.144.0 to 12.255.151.255 | 12.255.144.0/21 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.152.0 to 12.255.153.255 | 12.255.152.0/23 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.154.0 to 12.255.154.255 | 12.255.154.0/24 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.155.0 to 12.255.155.255 | 12.255.155.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.255.156.0 to 12.255.159.255 | 12.255.156.0/22 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.160.0 to 12.255.167.255 | 12.255.160.0/21 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.168.0 to 12.255.169.255 | 12.255.168.0/23 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.170.0 to 12.255.170.255 | 12.255.170.0/24 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.171.0 to 12.255.171.255 | 12.255.171.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.255.172.0 to 12.255.175.255 | 12.255.172.0/22 | AS17224 | AT&T Enhanced Network Services | See Range |
| 12.255.176.0 to 12.255.191.255 | 12.255.176.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.255.192.0 to 12.255.255.255 | 12.255.192.0/18 | AS7018 | AT&T Services Inc. | See Range |
| 13.0.0.0 to 13.0.127.255 | 13.0.0.0/17 | - | Name Not Defined | See Range |
| 13.0.128.0 to 13.0.191.255 | 13.0.128.0/18 | - | Name Not Defined | See Range |
| 13.0.192.0 to 13.0.199.255 | 13.0.192.0/21 | - | Name Not Defined | See Range |
| 13.0.200.0 to 13.0.207.255 | 13.0.200.0/21 | AS33631 | Palo Alto Research Center Incorporated | See Range |
| 13.0.208.0 to 13.0.215.255 | 13.0.208.0/21 | AS33631 | Palo Alto Research Center Incorporated | See Range |
| 13.0.216.0 to 13.0.223.255 | 13.0.216.0/21 | - | Name Not Defined | See Range |
| 13.0.224.0 to 13.0.255.255 | 13.0.224.0/19 | - | Name Not Defined | See Range |
| 13.1.0.0 to 13.1.63.255 | 13.1.0.0/18 | - | Name Not Defined | See Range |
| 13.1.64.0 to 13.1.71.255 | 13.1.64.0/21 | AS33631 | Palo Alto Research Center Incorporated | See Range |
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