The IP address 21.81.57 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 | 26/09/2018 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | US | United States | - | Houston | 29.7633 | -95.3633 | 2018-09-25 |
| MaxMind | US | United States | - | - | 37.751 | -97.822 | 2018-09-25 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.81.57.0 | 357644544 | 0 |
| 21.81.57.1 | 357644545 | 0 |
| 21.81.57.2 | 357644546 | 0 |
| 21.81.57.3 | 357644547 | 0 |
| 21.81.57.4 | 357644548 | 0 |
| 21.81.57.5 | 357644549 | 0 |
| 21.81.57.6 | 357644550 | 0 |
| 21.81.57.7 | 357644551 | 0 |
| 21.81.57.8 | 357644552 | 0 |
| 21.81.57.9 | 357644553 | 0 |
| 21.81.57.10 | 357644554 | 0 |
| 21.81.57.11 | 357644555 | 0 |
| 21.81.57.12 | 357644556 | 0 |
| 21.81.57.13 | 357644557 | 0 |
| 21.81.57.14 | 357644558 | 0 |
| 21.81.57.15 | 357644559 | 0 |
| 21.81.57.16 | 357644560 | 0 |
| 21.81.57.17 | 357644561 | 0 |
| 21.81.57.18 | 357644562 | 0 |
| 21.81.57.19 | 357644563 | 0 |
| 21.81.57.20 | 357644564 | 0 |
| 21.81.57.21 | 357644565 | 0 |
| 21.81.57.22 | 357644566 | 0 |
| 21.81.57.23 | 357644567 | 0 |
| 21.81.57.24 | 357644568 | 0 |
| 21.81.57.25 | 357644569 | 0 |
| 21.81.57.26 | 357644570 | 0 |
| 21.81.57.27 | 357644571 | 0 |
| 21.81.57.28 | 357644572 | 0 |
| 21.81.57.29 | 357644573 | 0 |
| 21.81.57.30 | 357644574 | 0 |
| 21.81.57.31 | 357644575 | 0 |
| 21.81.57.32 | 357644576 | 0 |
| 21.81.57.33 | 357644577 | 0 |
| 21.81.57.34 | 357644578 | 0 |
| 21.81.57.35 | 357644579 | 0 |
| 21.81.57.36 | 357644580 | 0 |
| 21.81.57.37 | 357644581 | 0 |
| 21.81.57.38 | 357644582 | 0 |
| 21.81.57.39 | 357644583 | 0 |
| 21.81.57.40 | 357644584 | 0 |
| 21.81.57.41 | 357644585 | 0 |
| 21.81.57.42 | 357644586 | 0 |
| 21.81.57.43 | 357644587 | 0 |
| 21.81.57.44 | 357644588 | 0 |
| 21.81.57.45 | 357644589 | 0 |
| 21.81.57.46 | 357644590 | 0 |
| 21.81.57.47 | 357644591 | 0 |
| 21.81.57.48 | 357644592 | 0 |
| 21.81.57.49 | 357644593 | 0 |
| 21.81.57.50 | 357644594 | 0 |
| 21.81.57.51 | 357644595 | 0 |
| 21.81.57.52 | 357644596 | 0 |
| 21.81.57.53 | 357644597 | 0 |
| 21.81.57.54 | 357644598 | 0 |
| 21.81.57.55 | 357644599 | 0 |
| 21.81.57.56 | 357644600 | 0 |
| 21.81.57.57 | 357644601 | 0 |
| 21.81.57.58 | 357644602 | 0 |
| 21.81.57.59 | 357644603 | 0 |
| 21.81.57.60 | 357644604 | 0 |
| 21.81.57.61 | 357644605 | 0 |
| 21.81.57.62 | 357644606 | 0 |
| 21.81.57.63 | 357644607 | 0 |
| 21.81.57.64 | 357644608 | 0 |
| 21.81.57.65 | 357644609 | 0 |
| 21.81.57.66 | 357644610 | 0 |
| 21.81.57.67 | 357644611 | 0 |
| 21.81.57.68 | 357644612 | 0 |
| 21.81.57.69 | 357644613 | 0 |
| 21.81.57.70 | 357644614 | 0 |
| 21.81.57.71 | 357644615 | 0 |
| 21.81.57.72 | 357644616 | 0 |
| 21.81.57.73 | 357644617 | 0 |
| 21.81.57.74 | 357644618 | 0 |
| 21.81.57.75 | 357644619 | 0 |
| 21.81.57.76 | 357644620 | 0 |
| 21.81.57.77 | 357644621 | 0 |
| 21.81.57.78 | 357644622 | 0 |
| 21.81.57.79 | 357644623 | 0 |
| 21.81.57.80 | 357644624 | 0 |
| 21.81.57.81 | 357644625 | 0 |
| 21.81.57.82 | 357644626 | 0 |
| 21.81.57.83 | 357644627 | 0 |
| 21.81.57.84 | 357644628 | 0 |
| 21.81.57.85 | 357644629 | 0 |