Les adresses IP débutant par 121.3.158 sont fournies par So-net Entertainment Corporation, elles appartiennent au CIDR (Classless Inter-Domain Routing) 121.2.0.0/15, le bloc IP comprant les adresses de 121.2.0.0 à 121.3.255.255). Le numéro de système autonome (ASN) est 2527.
| ASN | 2527 |
| IP commençant par | 121.2.0.0 |
| IP se terminant par | 121.3.255.255 |
| Nom ASN | So-net Entertainment Corporation |
| CDIR | 121.2.0.0/15 |
| IP numérique | |
| Registe | apnic |
| Dernière mise à jour | 13/09/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | JP | Japon | - | Yokohama | 35,4442 | 139,6381 | 2017-09-13 |
| MaxMind | JP | Japon | - | Yokohama | 35,4478 | 139,6425 | 2017-09-13 |
| Whois | JP | - | - | - | 138 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.3.158.0 | 2030280192 | 0 |
| 121.3.158.1 | 2030280193 | 0 |
| 121.3.158.2 | 2030280194 | 0 |
| 121.3.158.3 | 2030280195 | 0 |
| 121.3.158.4 | 2030280196 | 0 |
| 121.3.158.5 | 2030280197 | 0 |
| 121.3.158.6 | 2030280198 | 0 |
| 121.3.158.7 | 2030280199 | 0 |
| 121.3.158.8 | 2030280200 | 0 |
| 121.3.158.9 | 2030280201 | 0 |
| 121.3.158.10 | 2030280202 | 0 |
| 121.3.158.11 | 2030280203 | 0 |
| 121.3.158.12 | 2030280204 | 0 |
| 121.3.158.13 | 2030280205 | 0 |
| 121.3.158.14 | 2030280206 | 0 |
| 121.3.158.15 | 2030280207 | 0 |
| 121.3.158.16 | 2030280208 | 0 |
| 121.3.158.17 | 2030280209 | 0 |
| 121.3.158.18 | 2030280210 | 0 |
| 121.3.158.19 | 2030280211 | 0 |
| 121.3.158.20 | 2030280212 | 0 |
| 121.3.158.21 | 2030280213 | 0 |
| 121.3.158.22 | 2030280214 | 0 |
| 121.3.158.23 | 2030280215 | 0 |
| 121.3.158.24 | 2030280216 | 0 |
| 121.3.158.25 | 2030280217 | 0 |
| 121.3.158.26 | 2030280218 | 0 |
| 121.3.158.27 | 2030280219 | 0 |
| 121.3.158.28 | 2030280220 | 0 |
| 121.3.158.29 | 2030280221 | 0 |
| 121.3.158.30 | 2030280222 | 0 |
| 121.3.158.31 | 2030280223 | 0 |
| 121.3.158.32 | 2030280224 | 0 |
| 121.3.158.33 | 2030280225 | 0 |
| 121.3.158.34 | 2030280226 | 0 |
| 121.3.158.35 | 2030280227 | 0 |
| 121.3.158.36 | 2030280228 | 0 |
| 121.3.158.37 | 2030280229 | 0 |
| 121.3.158.38 | 2030280230 | 0 |
| 121.3.158.39 | 2030280231 | 0 |
| 121.3.158.40 | 2030280232 | 0 |
| 121.3.158.41 | 2030280233 | 0 |
| 121.3.158.42 | 2030280234 | 0 |
| 121.3.158.43 | 2030280235 | 0 |
| 121.3.158.44 | 2030280236 | 0 |
| 121.3.158.45 | 2030280237 | 0 |
| 121.3.158.46 | 2030280238 | 0 |
| 121.3.158.47 | 2030280239 | 0 |
| 121.3.158.48 | 2030280240 | 0 |
| 121.3.158.49 | 2030280241 | 0 |
| 121.3.158.50 | 2030280242 | 0 |
| 121.3.158.51 | 2030280243 | 0 |
| 121.3.158.52 | 2030280244 | 0 |
| 121.3.158.53 | 2030280245 | 0 |
| 121.3.158.54 | 2030280246 | 0 |
| 121.3.158.55 | 2030280247 | 0 |
| 121.3.158.56 | 2030280248 | 0 |
| 121.3.158.57 | 2030280249 | 0 |
| 121.3.158.58 | 2030280250 | 0 |
| 121.3.158.59 | 2030280251 | 0 |
| 121.3.158.60 | 2030280252 | 0 |
| 121.3.158.61 | 2030280253 | 0 |
| 121.3.158.62 | 2030280254 | 0 |
| 121.3.158.63 | 2030280255 | 0 |
| 121.3.158.64 | 2030280256 | 0 |
| 121.3.158.65 | 2030280257 | 0 |
| 121.3.158.66 | 2030280258 | 0 |
| 121.3.158.67 | 2030280259 | 0 |
| 121.3.158.68 | 2030280260 | 0 |
| 121.3.158.69 | 2030280261 | 0 |
| 121.3.158.70 | 2030280262 | 0 |
| 121.3.158.71 | 2030280263 | 0 |
| 121.3.158.72 | 2030280264 | 0 |
| 121.3.158.73 | 2030280265 | 0 |
| 121.3.158.74 | 2030280266 | 0 |
| 121.3.158.75 | 2030280267 | 0 |
| 121.3.158.76 | 2030280268 | 0 |
| 121.3.158.77 | 2030280269 | 0 |
| 121.3.158.78 | 2030280270 | 0 |
| 121.3.158.79 | 2030280271 | 0 |
| 121.3.158.80 | 2030280272 | 0 |
| 121.3.158.81 | 2030280273 | 0 |
| 121.3.158.82 | 2030280274 | 0 |
| 121.3.158.83 | 2030280275 | 0 |
| 121.3.158.84 | 2030280276 | 0 |
| 121.3.158.85 | 2030280277 | 0 |