The IP address 172.21.56 is provided by AT&T Services, Inc., it's belong to the CDIR (Classless Inter-Domain Routing) 172.0.0.0/12 (range 172.0.0.0 to 172.15.255.255). The autonomous system number (ASN) is 7018.
| ASN | 7018 |
| IP starting by | 172.0.0.0 |
| IP ending by | 172.15.255.255 |
| ASN Name | AT&T Services, Inc. |
| CDIR | 172.0.0.0/12 |
| Numerical IP | |
| Registry | arin |
| Last update | 04/07/2017 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | - | - | - | - | 0 | 0 | 2017-07-04 |
| MaxMind | US | United States | - | Valencia | 34.418 | -118.5662 | 2017-07-04 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 172.21.56.0 | 2887071744 | 0 |
| 172.21.56.1 | 2887071745 | 0 |
| 172.21.56.2 | 2887071746 | 0 |
| 172.21.56.3 | 2887071747 | 0 |
| 172.21.56.4 | 2887071748 | 0 |
| 172.21.56.5 | 2887071749 | 0 |
| 172.21.56.6 | 2887071750 | 0 |
| 172.21.56.7 | 2887071751 | 0 |
| 172.21.56.8 | 2887071752 | 0 |
| 172.21.56.9 | 2887071753 | 0 |
| 172.21.56.10 | 2887071754 | 0 |
| 172.21.56.11 | 2887071755 | 0 |
| 172.21.56.12 | 2887071756 | 0 |
| 172.21.56.13 | 2887071757 | 0 |
| 172.21.56.14 | 2887071758 | 0 |
| 172.21.56.15 | 2887071759 | 0 |
| 172.21.56.16 | 2887071760 | 0 |
| 172.21.56.17 | 2887071761 | 0 |
| 172.21.56.18 | 2887071762 | 0 |
| 172.21.56.19 | 2887071763 | 0 |
| 172.21.56.20 | 2887071764 | 0 |
| 172.21.56.21 | 2887071765 | 0 |
| 172.21.56.22 | 2887071766 | 0 |
| 172.21.56.23 | 2887071767 | 0 |
| 172.21.56.24 | 2887071768 | 0 |
| 172.21.56.25 | 2887071769 | 0 |
| 172.21.56.26 | 2887071770 | 0 |
| 172.21.56.27 | 2887071771 | 0 |
| 172.21.56.28 | 2887071772 | 0 |
| 172.21.56.29 | 2887071773 | 0 |
| 172.21.56.30 | 2887071774 | 0 |
| 172.21.56.31 | 2887071775 | 0 |
| 172.21.56.32 | 2887071776 | 0 |
| 172.21.56.33 | 2887071777 | 0 |
| 172.21.56.34 | 2887071778 | 0 |
| 172.21.56.35 | 2887071779 | 0 |
| 172.21.56.36 | 2887071780 | 0 |
| 172.21.56.37 | 2887071781 | 0 |
| 172.21.56.38 | 2887071782 | 0 |
| 172.21.56.39 | 2887071783 | 0 |
| 172.21.56.40 | 2887071784 | 0 |
| 172.21.56.41 | 2887071785 | 0 |
| 172.21.56.42 | 2887071786 | 0 |
| 172.21.56.43 | 2887071787 | 0 |
| 172.21.56.44 | 2887071788 | 0 |
| 172.21.56.45 | 2887071789 | 0 |
| 172.21.56.46 | 2887071790 | 0 |
| 172.21.56.47 | 2887071791 | 0 |
| 172.21.56.48 | 2887071792 | 0 |
| 172.21.56.49 | 2887071793 | 0 |
| 172.21.56.50 | 2887071794 | 0 |
| 172.21.56.51 | 2887071795 | 0 |
| 172.21.56.52 | 2887071796 | 0 |
| 172.21.56.53 | 2887071797 | 0 |
| 172.21.56.54 | 2887071798 | 0 |
| 172.21.56.55 | 2887071799 | 0 |
| 172.21.56.56 | 2887071800 | 0 |
| 172.21.56.57 | 2887071801 | 0 |
| 172.21.56.58 | 2887071802 | 0 |
| 172.21.56.59 | 2887071803 | 0 |
| 172.21.56.60 | 2887071804 | 0 |
| 172.21.56.61 | 2887071805 | 0 |
| 172.21.56.62 | 2887071806 | 0 |
| 172.21.56.63 | 2887071807 | 0 |
| 172.21.56.64 | 2887071808 | 0 |
| 172.21.56.65 | 2887071809 | 0 |
| 172.21.56.66 | 2887071810 | 0 |
| 172.21.56.67 | 2887071811 | 0 |
| 172.21.56.68 | 2887071812 | 0 |
| 172.21.56.69 | 2887071813 | 0 |
| 172.21.56.70 | 2887071814 | 0 |
| 172.21.56.71 | 2887071815 | 0 |
| 172.21.56.72 | 2887071816 | 0 |
| 172.21.56.73 | 2887071817 | 0 |
| 172.21.56.74 | 2887071818 | 0 |
| 172.21.56.75 | 2887071819 | 0 |
| 172.21.56.76 | 2887071820 | 0 |
| 172.21.56.77 | 2887071821 | 0 |
| 172.21.56.78 | 2887071822 | 0 |
| 172.21.56.79 | 2887071823 | 0 |
| 172.21.56.80 | 2887071824 | 0 |
| 172.21.56.81 | 2887071825 | 0 |
| 172.21.56.82 | 2887071826 | 0 |
| 172.21.56.83 | 2887071827 | 0 |
| 172.21.56.84 | 2887071828 | 0 |
| 172.21.56.85 | 2887071829 | 0 |