Les adresses IP débutant par 21.99.37 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 | 23/10/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | US | États-Unis | - | Columbus | 39,9664 | -83,0128 | 2017-10-23 |
| MaxMind | US | États-Unis | - | - | 37,751 | -97,822 | 2017-10-23 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.99.37.0 | 358819072 | 0 |
| 21.99.37.1 | 358819073 | 0 |
| 21.99.37.2 | 358819074 | 0 |
| 21.99.37.3 | 358819075 | 0 |
| 21.99.37.4 | 358819076 | 0 |
| 21.99.37.5 | 358819077 | 0 |
| 21.99.37.6 | 358819078 | 0 |
| 21.99.37.7 | 358819079 | 0 |
| 21.99.37.8 | 358819080 | 0 |
| 21.99.37.9 | 358819081 | 0 |
| 21.99.37.10 | 358819082 | 0 |
| 21.99.37.11 | 358819083 | 0 |
| 21.99.37.12 | 358819084 | 0 |
| 21.99.37.13 | 358819085 | 0 |
| 21.99.37.14 | 358819086 | 0 |
| 21.99.37.15 | 358819087 | 0 |
| 21.99.37.16 | 358819088 | 0 |
| 21.99.37.17 | 358819089 | 0 |
| 21.99.37.18 | 358819090 | 0 |
| 21.99.37.19 | 358819091 | 0 |
| 21.99.37.20 | 358819092 | 0 |
| 21.99.37.21 | 358819093 | 0 |
| 21.99.37.22 | 358819094 | 0 |
| 21.99.37.23 | 358819095 | 0 |
| 21.99.37.24 | 358819096 | 0 |
| 21.99.37.25 | 358819097 | 0 |
| 21.99.37.26 | 358819098 | 0 |
| 21.99.37.27 | 358819099 | 0 |
| 21.99.37.28 | 358819100 | 0 |
| 21.99.37.29 | 358819101 | 0 |
| 21.99.37.30 | 358819102 | 0 |
| 21.99.37.31 | 358819103 | 0 |
| 21.99.37.32 | 358819104 | 0 |
| 21.99.37.33 | 358819105 | 0 |
| 21.99.37.34 | 358819106 | 0 |
| 21.99.37.35 | 358819107 | 0 |
| 21.99.37.36 | 358819108 | 0 |
| 21.99.37.37 | 358819109 | 0 |
| 21.99.37.38 | 358819110 | 0 |
| 21.99.37.39 | 358819111 | 0 |
| 21.99.37.40 | 358819112 | 0 |
| 21.99.37.41 | 358819113 | 0 |
| 21.99.37.42 | 358819114 | 0 |
| 21.99.37.43 | 358819115 | 0 |
| 21.99.37.44 | 358819116 | 0 |
| 21.99.37.45 | 358819117 | 0 |
| 21.99.37.46 | 358819118 | 0 |
| 21.99.37.47 | 358819119 | 0 |
| 21.99.37.48 | 358819120 | 0 |
| 21.99.37.49 | 358819121 | 0 |
| 21.99.37.50 | 358819122 | 0 |
| 21.99.37.51 | 358819123 | 0 |
| 21.99.37.52 | 358819124 | 0 |
| 21.99.37.53 | 358819125 | 0 |
| 21.99.37.54 | 358819126 | 0 |
| 21.99.37.55 | 358819127 | 0 |
| 21.99.37.56 | 358819128 | 0 |
| 21.99.37.57 | 358819129 | 0 |
| 21.99.37.58 | 358819130 | 0 |
| 21.99.37.59 | 358819131 | 0 |
| 21.99.37.60 | 358819132 | 0 |
| 21.99.37.61 | 358819133 | 0 |
| 21.99.37.62 | 358819134 | 0 |
| 21.99.37.63 | 358819135 | 0 |
| 21.99.37.64 | 358819136 | 0 |
| 21.99.37.65 | 358819137 | 0 |
| 21.99.37.66 | 358819138 | 0 |
| 21.99.37.67 | 358819139 | 0 |
| 21.99.37.68 | 358819140 | 0 |
| 21.99.37.69 | 358819141 | 0 |
| 21.99.37.70 | 358819142 | 0 |
| 21.99.37.71 | 358819143 | 0 |
| 21.99.37.72 | 358819144 | 0 |
| 21.99.37.73 | 358819145 | 0 |
| 21.99.37.74 | 358819146 | 0 |
| 21.99.37.75 | 358819147 | 0 |
| 21.99.37.76 | 358819148 | 0 |
| 21.99.37.77 | 358819149 | 0 |
| 21.99.37.78 | 358819150 | 0 |
| 21.99.37.79 | 358819151 | 0 |
| 21.99.37.80 | 358819152 | 0 |
| 21.99.37.81 | 358819153 | 0 |
| 21.99.37.82 | 358819154 | 0 |
| 21.99.37.83 | 358819155 | 0 |
| 21.99.37.84 | 358819156 | 0 |
| 21.99.37.85 | 358819157 | 0 |