Les adresses IP débutant par 21.91.28 sont fournies par China Education and Research Network Center, elles appartiennent au CIDR (Classless Inter-Domain Routing) 22.30.204.0/23, le bloc IP comprant les adresses de 22.30.204.0 à 22.30.205.255). Le numéro de système autonome (ASN) est 4538.
| ASN | 4538 |
| IP commençant par | 22.30.204.0 |
| IP se terminant par | 22.30.205.255 |
| Nom ASN | China Education and Research Network Center |
| CDIR | 22.30.204.0/23 |
| IP numérique | |
| Registe | |
| Dernière mise à jour | 19/07/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | US | États-Unis | - | Columbus | 39,9664 | -83,0128 | 2017-07-19 |
| MaxMind | US | États-Unis | - | - | 37,751 | -97,822 | 2017-07-19 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.91.28.0 | 358292480 | 0 |
| 21.91.28.1 | 358292481 | 0 |
| 21.91.28.2 | 358292482 | 0 |
| 21.91.28.3 | 358292483 | 0 |
| 21.91.28.4 | 358292484 | 0 |
| 21.91.28.5 | 358292485 | 0 |
| 21.91.28.6 | 358292486 | 0 |
| 21.91.28.7 | 358292487 | 0 |
| 21.91.28.8 | 358292488 | 0 |
| 21.91.28.9 | 358292489 | 0 |
| 21.91.28.10 | 358292490 | 0 |
| 21.91.28.11 | 358292491 | 0 |
| 21.91.28.12 | 358292492 | 0 |
| 21.91.28.13 | 358292493 | 0 |
| 21.91.28.14 | 358292494 | 0 |
| 21.91.28.15 | 358292495 | 0 |
| 21.91.28.16 | 358292496 | 0 |
| 21.91.28.17 | 358292497 | 0 |
| 21.91.28.18 | 358292498 | 0 |
| 21.91.28.19 | 358292499 | 0 |
| 21.91.28.20 | 358292500 | 0 |
| 21.91.28.21 | 358292501 | 0 |
| 21.91.28.22 | 358292502 | 0 |
| 21.91.28.23 | 358292503 | 0 |
| 21.91.28.24 | 358292504 | 0 |
| 21.91.28.25 | 358292505 | 0 |
| 21.91.28.26 | 358292506 | 0 |
| 21.91.28.27 | 358292507 | 0 |
| 21.91.28.28 | 358292508 | 0 |
| 21.91.28.29 | 358292509 | 0 |
| 21.91.28.30 | 358292510 | 0 |
| 21.91.28.31 | 358292511 | 0 |
| 21.91.28.32 | 358292512 | 0 |
| 21.91.28.33 | 358292513 | 0 |
| 21.91.28.34 | 358292514 | 0 |
| 21.91.28.35 | 358292515 | 0 |
| 21.91.28.36 | 358292516 | 0 |
| 21.91.28.37 | 358292517 | 0 |
| 21.91.28.38 | 358292518 | 0 |
| 21.91.28.39 | 358292519 | 0 |
| 21.91.28.40 | 358292520 | 0 |
| 21.91.28.41 | 358292521 | 0 |
| 21.91.28.42 | 358292522 | 0 |
| 21.91.28.43 | 358292523 | 0 |
| 21.91.28.44 | 358292524 | 0 |
| 21.91.28.45 | 358292525 | 0 |
| 21.91.28.46 | 358292526 | 0 |
| 21.91.28.47 | 358292527 | 0 |
| 21.91.28.48 | 358292528 | 0 |
| 21.91.28.49 | 358292529 | 0 |
| 21.91.28.50 | 358292530 | 0 |
| 21.91.28.51 | 358292531 | 0 |
| 21.91.28.52 | 358292532 | 0 |
| 21.91.28.53 | 358292533 | 0 |
| 21.91.28.54 | 358292534 | 0 |
| 21.91.28.55 | 358292535 | 0 |
| 21.91.28.56 | 358292536 | 0 |
| 21.91.28.57 | 358292537 | 0 |
| 21.91.28.58 | 358292538 | 0 |
| 21.91.28.59 | 358292539 | 0 |
| 21.91.28.60 | 358292540 | 0 |
| 21.91.28.61 | 358292541 | 0 |
| 21.91.28.62 | 358292542 | 0 |
| 21.91.28.63 | 358292543 | 0 |
| 21.91.28.64 | 358292544 | 0 |
| 21.91.28.65 | 358292545 | 0 |
| 21.91.28.66 | 358292546 | 0 |
| 21.91.28.67 | 358292547 | 0 |
| 21.91.28.68 | 358292548 | 0 |
| 21.91.28.69 | 358292549 | 0 |
| 21.91.28.70 | 358292550 | 0 |
| 21.91.28.71 | 358292551 | 0 |
| 21.91.28.72 | 358292552 | 0 |
| 21.91.28.73 | 358292553 | 0 |
| 21.91.28.74 | 358292554 | 0 |
| 21.91.28.75 | 358292555 | 0 |
| 21.91.28.76 | 358292556 | 0 |
| 21.91.28.77 | 358292557 | 0 |
| 21.91.28.78 | 358292558 | 0 |
| 21.91.28.79 | 358292559 | 0 |
| 21.91.28.80 | 358292560 | 0 |
| 21.91.28.81 | 358292561 | 0 |
| 21.91.28.82 | 358292562 | 0 |
| 21.91.28.83 | 358292563 | 0 |
| 21.91.28.84 | 358292564 | 0 |
| 21.91.28.85 | 358292565 | 0 |