Les adresses IP débutant par 121.3.155 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 | 20/07/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | JP | Japan | - | Tokyo | 35,6895 | 139,6917 | 2017-07-19 |
| MaxMind | JP | Japon | - | Tokyo | 35,6427 | 139,7677 | 2017-07-19 |
| Whois | JP | - | - | - | 138 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.3.155.0 | 2030279424 | 0 |
| 121.3.155.1 | 2030279425 | 0 |
| 121.3.155.2 | 2030279426 | 0 |
| 121.3.155.3 | 2030279427 | 0 |
| 121.3.155.4 | 2030279428 | 0 |
| 121.3.155.5 | 2030279429 | 0 |
| 121.3.155.6 | 2030279430 | 0 |
| 121.3.155.7 | 2030279431 | 0 |
| 121.3.155.8 | 2030279432 | 0 |
| 121.3.155.9 | 2030279433 | 0 |
| 121.3.155.10 | 2030279434 | 0 |
| 121.3.155.11 | 2030279435 | 0 |
| 121.3.155.12 | 2030279436 | 0 |
| 121.3.155.13 | 2030279437 | 0 |
| 121.3.155.14 | 2030279438 | 0 |
| 121.3.155.15 | 2030279439 | 0 |
| 121.3.155.16 | 2030279440 | 0 |
| 121.3.155.17 | 2030279441 | 0 |
| 121.3.155.18 | 2030279442 | 0 |
| 121.3.155.19 | 2030279443 | 0 |
| 121.3.155.20 | 2030279444 | 0 |
| 121.3.155.21 | 2030279445 | 0 |
| 121.3.155.22 | 2030279446 | 0 |
| 121.3.155.23 | 2030279447 | 0 |
| 121.3.155.24 | 2030279448 | 0 |
| 121.3.155.25 | 2030279449 | 0 |
| 121.3.155.26 | 2030279450 | 0 |
| 121.3.155.27 | 2030279451 | 0 |
| 121.3.155.28 | 2030279452 | 0 |
| 121.3.155.29 | 2030279453 | 0 |
| 121.3.155.30 | 2030279454 | 0 |
| 121.3.155.31 | 2030279455 | 0 |
| 121.3.155.32 | 2030279456 | 0 |
| 121.3.155.33 | 2030279457 | 0 |
| 121.3.155.34 | 2030279458 | 0 |
| 121.3.155.35 | 2030279459 | 0 |
| 121.3.155.36 | 2030279460 | 0 |
| 121.3.155.37 | 2030279461 | 0 |
| 121.3.155.38 | 2030279462 | 0 |
| 121.3.155.39 | 2030279463 | 0 |
| 121.3.155.40 | 2030279464 | 0 |
| 121.3.155.41 | 2030279465 | 0 |
| 121.3.155.42 | 2030279466 | 0 |
| 121.3.155.43 | 2030279467 | 0 |
| 121.3.155.44 | 2030279468 | 0 |
| 121.3.155.45 | 2030279469 | 0 |
| 121.3.155.46 | 2030279470 | 0 |
| 121.3.155.47 | 2030279471 | 0 |
| 121.3.155.48 | 2030279472 | 0 |
| 121.3.155.49 | 2030279473 | 0 |
| 121.3.155.50 | 2030279474 | 0 |
| 121.3.155.51 | 2030279475 | 0 |
| 121.3.155.52 | 2030279476 | 0 |
| 121.3.155.53 | 2030279477 | 0 |
| 121.3.155.54 | 2030279478 | 0 |
| 121.3.155.55 | 2030279479 | 0 |
| 121.3.155.56 | 2030279480 | 0 |
| 121.3.155.57 | 2030279481 | 0 |
| 121.3.155.58 | 2030279482 | 0 |
| 121.3.155.59 | 2030279483 | 0 |
| 121.3.155.60 | 2030279484 | 0 |
| 121.3.155.61 | 2030279485 | 0 |
| 121.3.155.62 | 2030279486 | 0 |
| 121.3.155.63 | 2030279487 | 0 |
| 121.3.155.64 | 2030279488 | 0 |
| 121.3.155.65 | 2030279489 | 0 |
| 121.3.155.66 | 2030279490 | 0 |
| 121.3.155.67 | 2030279491 | 0 |
| 121.3.155.68 | 2030279492 | 0 |
| 121.3.155.69 | 2030279493 | 0 |
| 121.3.155.70 | 2030279494 | 0 |
| 121.3.155.71 | 2030279495 | 0 |
| 121.3.155.72 | 2030279496 | 0 |
| 121.3.155.73 | 2030279497 | 0 |
| 121.3.155.74 | 2030279498 | 0 |
| 121.3.155.75 | 2030279499 | 0 |
| 121.3.155.76 | 2030279500 | 0 |
| 121.3.155.77 | 2030279501 | 0 |
| 121.3.155.78 | 2030279502 | 0 |
| 121.3.155.79 | 2030279503 | 0 |
| 121.3.155.80 | 2030279504 | 0 |
| 121.3.155.81 | 2030279505 | 0 |
| 121.3.155.82 | 2030279506 | 0 |
| 121.3.155.83 | 2030279507 | 0 |
| 121.3.155.84 | 2030279508 | 0 |
| 121.3.155.85 | 2030279509 | 0 |