IPv4 AS & ASN Directory
| IP Range | CIDR | ASN | AS Name | |
|---|---|---|---|---|
| 12.21.155.0 to 12.21.155.255 | 12.21.155.0/24 | AS13760 | Uniti Fiber Holdings Inc. | See Range |
| 12.21.156.0 to 12.21.159.255 | 12.21.156.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.160.0 to 12.21.191.255 | 12.21.160.0/19 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.192.0 to 12.21.193.255 | 12.21.192.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.194.0 to 12.21.194.255 | 12.21.194.0/24 | AS3801 | Mikrotec Internet Services | See Range |
| 12.21.195.0 to 12.21.195.255 | 12.21.195.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.196.0 to 12.21.199.255 | 12.21.196.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.200.0 to 12.21.203.255 | 12.21.200.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.204.0 to 12.21.204.255 | 12.21.204.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.205.0 to 12.21.205.255 | 12.21.205.0/24 | AS398229 | Mobile Communications LLC | See Range |
| 12.21.206.0 to 12.21.206.255 | 12.21.206.0/24 | AS398229 | Mobile Communications LLC | See Range |
| 12.21.207.0 to 12.21.207.255 | 12.21.207.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.208.0 to 12.21.223.255 | 12.21.208.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.224.0 to 12.21.227.255 | 12.21.224.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.228.0 to 12.21.228.255 | 12.21.228.0/24 | AS30525 | Global Linking Solutions | See Range |
| 12.21.229.0 to 12.21.229.255 | 12.21.229.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.230.0 to 12.21.231.255 | 12.21.230.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.232.0 to 12.21.239.255 | 12.21.232.0/21 | AS7018 | AT&T Services Inc. | See Range |
| 12.21.240.0 to 12.21.255.255 | 12.21.240.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.22.0.0 to 12.22.7.255 | 12.22.0.0/21 | AS7018 | AT&T Services Inc. | See Range |
| 12.22.8.0 to 12.22.8.255 | 12.22.8.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.22.9.0 to 12.22.9.255 | 12.22.9.0/24 | AS2386 | AT&T Data Communications Services | See Range |
| 12.22.10.0 to 12.22.11.255 | 12.22.10.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.22.12.0 to 12.22.15.255 | 12.22.12.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.22.16.0 to 12.22.31.255 | 12.22.16.0/20 | AS7018 | AT&T Services Inc. | See Range |
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