IPv4 AS & ASN Directory
| IP Range | CIDR | ASN | AS Name | |
|---|---|---|---|---|
| 12.20.126.0 to 12.20.126.255 | 12.20.126.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.127.0 to 12.20.127.255 | 12.20.127.0/24 | AS14639 | Allegiance Healthcare Corporation | See Range |
| 12.20.128.0 to 12.20.143.255 | 12.20.128.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.144.0 to 12.20.151.255 | 12.20.144.0/21 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.152.0 to 12.20.153.255 | 12.20.152.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.154.0 to 12.20.154.255 | 12.20.154.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.155.0 to 12.20.155.255 | 12.20.155.0/24 | AS396199 | Swedish Match | See Range |
| 12.20.156.0 to 12.20.157.255 | 12.20.156.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.158.0 to 12.20.158.255 | 12.20.158.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.159.0 to 12.20.159.255 | 12.20.159.0/24 | AS2386 | AT&T Data Communications Services | See Range |
| 12.20.160.0 to 12.20.175.255 | 12.20.160.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.176.0 to 12.20.177.255 | 12.20.176.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.178.0 to 12.20.178.255 | 12.20.178.0/24 | AS2386 | AT&T Data Communications Services | See Range |
| 12.20.179.0 to 12.20.179.255 | 12.20.179.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.180.0 to 12.20.183.255 | 12.20.180.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.184.0 to 12.20.187.255 | 12.20.184.0/22 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.188.0 to 12.20.188.255 | 12.20.188.0/24 | AS22249 | Maxell Corporation of America | See Range |
| 12.20.189.0 to 12.20.189.255 | 12.20.189.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.190.0 to 12.20.191.255 | 12.20.190.0/23 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.192.0 to 12.20.223.255 | 12.20.192.0/19 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.224.0 to 12.20.239.255 | 12.20.224.0/20 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.240.0 to 12.20.247.255 | 12.20.240.0/21 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.248.0 to 12.20.248.255 | 12.20.248.0/24 | AS7018 | AT&T Services Inc. | See Range |
| 12.20.249.0 to 12.20.249.255 | 12.20.249.0/24 | AS30308 | Mid-Atlantic Corporate Federal Credit Union | See Range |
| 12.20.250.0 to 12.20.251.255 | 12.20.250.0/23 | AS7018 | AT&T Services Inc. | See Range |
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