Autonomous Systems are networks typically governed by large ISPs that participate in global Internet routing. Each network is assigned a unique identification number known as the AS number or ASN by the Internet Assigned Numbers Authority.
| ASN | 5672 |
|---|
| Name | PBI-NET-BLK |
|---|
| Organization | AT&T Corp. |
|---|
| Country | United States 
|
|---|
| Registry | ARIN |
|---|
| IPv4 addresses | 6,400 |
|---|
| IPv6 /64 networks | 0 |
|---|
| Prefixes | 5 |
|---|
Other ASN allocated to AT&T Corp.
| ASN |
Name |
IP addresses |
| 6389 |
BELLSOUTH-NET-BLK |
9,708,052 |
| 19957 |
TENNESSEE-NET |
614,400 |
| 4186 |
ATTIS-ASN4186 |
267,520 |
| 4185 |
ATTIS-ASN4185 |
267,264 |
| 7287 |
PBI-NET-BLK2 |
180,224 |
| 16967 |
SBCIDC-DLLSTX |
82,176 |
| 16966 |
SBCIDC-LSAN03 |
58,112 |
| 5671 |
PBI-NET-BLK |
14,848 |
| 7286 |
PBI-NET-BLK2 |
10,240 |
| 4473 |
ATTIS-ASN4473 |
9,472 |
| 6384 |
BELLSOUTH-NET-BLK |
7,680 |
| 6385 |
BELLSOUTH-NET-BLK |
7,168 |
| 19483 |
SBCASI-AKRON-OH-COVLIL |
7,168 |
| 6381 |
BELLSOUTH-NET-BLK |
5,376 |
| 13965 |
SBCIS-FYTVAR |
4,352 |
| 5104 |
ATTIS-ASN5104 |
4,096 |
| 16959 |
SBIS-AMRLTX |
2,304 |
| 10770 |
SBIS-ASN-BLK-2 |
2,048 |
| 6382 |
BELLSOUTH-NET-BLK |
1,536 |
| 19495 |
SBCASI-AKRON-OH-COVLIL |
768 |
| 16961 |
HIPCS-DALLAS-SERVER-OFFICE |
512 |
| 16964 |
HIPCS-NEW-YORK-ACCESS-OFFICE |
0 |
| 19956 |
TENNESSEE-NET |
0 |
| 19496 |
SBCASI-AKRON-OH-COVLIL |
0 |
| 19485 |
SBCASI-AKRON-OH-COVLIL |
0 |
| 19486 |
SBCASI-AKRON-OH-COVLIL |
0 |
| 10774 |
SBIS-ASN-BLK-2 |
0 |
| 3422 |
ATTIS-ASN3422 |
0 |
| 5103 |
ATTIS-ASN5103 |
0 |
| 5107 |
ATTIS-ASN5107 |
0 |
| 6383 |
BELLSOUTH-NET-BLK |
0 |
| 7132 |
SBIS-AS |
0 |
| 7294 |
SBIS-BLK |
0 |
| 7891 |
BELLSOUTH-NET-BLK2 |
0 |
| 8061 |
BELLSOUTH-NET-BLK3 |
0 |
| 8063 |
BELLSOUTH-NET-BLK3 |
0 |
| 10771 |
SBIS-ASN-BLK-2 |
0 |
| 10772 |
SBIS-ASN-BLK-2 |
0 |
| 1698 |
PRODIGY |
0 |