The IP address 21.72.37 is provided by China Education and Research Network Center, it's belong to the CDIR (Classless Inter-Domain Routing) 22.30.204.0/23 (range 22.30.204.0 to 22.30.205.255). The autonomous system number (ASN) is 4538.
| ASN | 4538 |
| IP starting by | 22.30.204.0 |
| IP ending by | 22.30.205.255 |
| ASN Name | China Education and Research Network Center |
| CDIR | 22.30.204.0/23 |
| Numerical IP | |
| Registry | |
| Last update | 28/08/2017 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | US | United States | - | Columbus | 39.9664 | -83.0128 | 2017-08-28 |
| MaxMind | US | United States | - | - | 37.751 | -97.822 | 2017-08-28 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.72.37.0 | 357049600 | 0 |
| 21.72.37.1 | 357049601 | 0 |
| 21.72.37.2 | 357049602 | 0 |
| 21.72.37.3 | 357049603 | 0 |
| 21.72.37.4 | 357049604 | 0 |
| 21.72.37.5 | 357049605 | 0 |
| 21.72.37.6 | 357049606 | 0 |
| 21.72.37.7 | 357049607 | 0 |
| 21.72.37.8 | 357049608 | 0 |
| 21.72.37.9 | 357049609 | 0 |
| 21.72.37.10 | 357049610 | 0 |
| 21.72.37.11 | 357049611 | 0 |
| 21.72.37.12 | 357049612 | 0 |
| 21.72.37.13 | 357049613 | 0 |
| 21.72.37.14 | 357049614 | 0 |
| 21.72.37.15 | 357049615 | 0 |
| 21.72.37.16 | 357049616 | 0 |
| 21.72.37.17 | 357049617 | 0 |
| 21.72.37.18 | 357049618 | 0 |
| 21.72.37.19 | 357049619 | 0 |
| 21.72.37.20 | 357049620 | 0 |
| 21.72.37.21 | 357049621 | 0 |
| 21.72.37.22 | 357049622 | 0 |
| 21.72.37.23 | 357049623 | 0 |
| 21.72.37.24 | 357049624 | 0 |
| 21.72.37.25 | 357049625 | 0 |
| 21.72.37.26 | 357049626 | 0 |
| 21.72.37.27 | 357049627 | 0 |
| 21.72.37.28 | 357049628 | 0 |
| 21.72.37.29 | 357049629 | 0 |
| 21.72.37.30 | 357049630 | 0 |
| 21.72.37.31 | 357049631 | 0 |
| 21.72.37.32 | 357049632 | 0 |
| 21.72.37.33 | 357049633 | 0 |
| 21.72.37.34 | 357049634 | 0 |
| 21.72.37.35 | 357049635 | 0 |
| 21.72.37.36 | 357049636 | 0 |
| 21.72.37.37 | 357049637 | 0 |
| 21.72.37.38 | 357049638 | 0 |
| 21.72.37.39 | 357049639 | 0 |
| 21.72.37.40 | 357049640 | 0 |
| 21.72.37.41 | 357049641 | 0 |
| 21.72.37.42 | 357049642 | 0 |
| 21.72.37.43 | 357049643 | 0 |
| 21.72.37.44 | 357049644 | 0 |
| 21.72.37.45 | 357049645 | 0 |
| 21.72.37.46 | 357049646 | 0 |
| 21.72.37.47 | 357049647 | 0 |
| 21.72.37.48 | 357049648 | 0 |
| 21.72.37.49 | 357049649 | 0 |
| 21.72.37.50 | 357049650 | 0 |
| 21.72.37.51 | 357049651 | 0 |
| 21.72.37.52 | 357049652 | 0 |
| 21.72.37.53 | 357049653 | 0 |
| 21.72.37.54 | 357049654 | 0 |
| 21.72.37.55 | 357049655 | 0 |
| 21.72.37.56 | 357049656 | 0 |
| 21.72.37.57 | 357049657 | 0 |
| 21.72.37.58 | 357049658 | 0 |
| 21.72.37.59 | 357049659 | 0 |
| 21.72.37.60 | 357049660 | 0 |
| 21.72.37.61 | 357049661 | 0 |
| 21.72.37.62 | 357049662 | 0 |
| 21.72.37.63 | 357049663 | 0 |
| 21.72.37.64 | 357049664 | 0 |
| 21.72.37.65 | 357049665 | 0 |
| 21.72.37.66 | 357049666 | 0 |
| 21.72.37.67 | 357049667 | 0 |
| 21.72.37.68 | 357049668 | 0 |
| 21.72.37.69 | 357049669 | 0 |
| 21.72.37.70 | 357049670 | 0 |
| 21.72.37.71 | 357049671 | 0 |
| 21.72.37.72 | 357049672 | 0 |
| 21.72.37.73 | 357049673 | 0 |
| 21.72.37.74 | 357049674 | 0 |
| 21.72.37.75 | 357049675 | 0 |
| 21.72.37.76 | 357049676 | 0 |
| 21.72.37.77 | 357049677 | 0 |
| 21.72.37.78 | 357049678 | 0 |
| 21.72.37.79 | 357049679 | 0 |
| 21.72.37.80 | 357049680 | 0 |
| 21.72.37.81 | 357049681 | 0 |
| 21.72.37.82 | 357049682 | 0 |
| 21.72.37.83 | 357049683 | 0 |
| 21.72.37.84 | 357049684 | 0 |
| 21.72.37.85 | 357049685 | 0 |