Les adresses IP débutant par 121.131.4 sont fournies par Korea Telecom, elles appartiennent au CIDR (Classless Inter-Domain Routing) 121.128.0.0/11, le bloc IP comprant les adresses de 121.128.0.0 à 121.159.255.255). Le numéro de système autonome (ASN) est 4766.
| ASN | 4766 |
| IP commençant par | 121.128.0.0 |
| IP se terminant par | 121.159.255.255 |
| Nom ASN | Korea Telecom |
| CDIR | 121.128.0.0/11 |
| IP numérique | |
| Registe | apnic |
| Dernière mise à jour | 25/08/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | KR | Korea, Republic of | - | Seoul | 37,5683 | 126,9778 | 2017-08-25 |
| MaxMind | KR | Corée du Sud | - | Seoul | 37,5111 | 126,9743 | 2017-08-25 |
| Whois | KR | - | - | - | 128 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.131.4.0 | 2038629376 | 0 |
| 121.131.4.1 | 2038629377 | 0 |
| 121.131.4.2 | 2038629378 | 0 |
| 121.131.4.3 | 2038629379 | 0 |
| 121.131.4.4 | 2038629380 | 0 |
| 121.131.4.5 | 2038629381 | 0 |
| 121.131.4.6 | 2038629382 | 0 |
| 121.131.4.7 | 2038629383 | 0 |
| 121.131.4.8 | 2038629384 | 0 |
| 121.131.4.9 | 2038629385 | 0 |
| 121.131.4.10 | 2038629386 | 0 |
| 121.131.4.11 | 2038629387 | 0 |
| 121.131.4.12 | 2038629388 | 0 |
| 121.131.4.13 | 2038629389 | 0 |
| 121.131.4.14 | 2038629390 | 0 |
| 121.131.4.15 | 2038629391 | 0 |
| 121.131.4.16 | 2038629392 | 0 |
| 121.131.4.17 | 2038629393 | 0 |
| 121.131.4.18 | 2038629394 | 0 |
| 121.131.4.19 | 2038629395 | 0 |
| 121.131.4.20 | 2038629396 | 0 |
| 121.131.4.21 | 2038629397 | 0 |
| 121.131.4.22 | 2038629398 | 0 |
| 121.131.4.23 | 2038629399 | 0 |
| 121.131.4.24 | 2038629400 | 0 |
| 121.131.4.25 | 2038629401 | 0 |
| 121.131.4.26 | 2038629402 | 0 |
| 121.131.4.27 | 2038629403 | 0 |
| 121.131.4.28 | 2038629404 | 0 |
| 121.131.4.29 | 2038629405 | 0 |
| 121.131.4.30 | 2038629406 | 0 |
| 121.131.4.31 | 2038629407 | 0 |
| 121.131.4.32 | 2038629408 | 0 |
| 121.131.4.33 | 2038629409 | 0 |
| 121.131.4.34 | 2038629410 | 0 |
| 121.131.4.35 | 2038629411 | 0 |
| 121.131.4.36 | 2038629412 | 0 |
| 121.131.4.37 | 2038629413 | 0 |
| 121.131.4.38 | 2038629414 | 0 |
| 121.131.4.39 | 2038629415 | 0 |
| 121.131.4.40 | 2038629416 | 0 |
| 121.131.4.41 | 2038629417 | 0 |
| 121.131.4.42 | 2038629418 | 0 |
| 121.131.4.43 | 2038629419 | 0 |
| 121.131.4.44 | 2038629420 | 0 |
| 121.131.4.45 | 2038629421 | 0 |
| 121.131.4.46 | 2038629422 | 0 |
| 121.131.4.47 | 2038629423 | 0 |
| 121.131.4.48 | 2038629424 | 0 |
| 121.131.4.49 | 2038629425 | 0 |
| 121.131.4.50 | 2038629426 | 0 |
| 121.131.4.51 | 2038629427 | 0 |
| 121.131.4.52 | 2038629428 | 0 |
| 121.131.4.53 | 2038629429 | 0 |
| 121.131.4.54 | 2038629430 | 0 |
| 121.131.4.55 | 2038629431 | 0 |
| 121.131.4.56 | 2038629432 | 0 |
| 121.131.4.57 | 2038629433 | 0 |
| 121.131.4.58 | 2038629434 | 0 |
| 121.131.4.59 | 2038629435 | 0 |
| 121.131.4.60 | 2038629436 | 0 |
| 121.131.4.61 | 2038629437 | 0 |
| 121.131.4.62 | 2038629438 | 0 |
| 121.131.4.63 | 2038629439 | 0 |
| 121.131.4.64 | 2038629440 | 0 |
| 121.131.4.65 | 2038629441 | 0 |
| 121.131.4.66 | 2038629442 | 0 |
| 121.131.4.67 | 2038629443 | 0 |
| 121.131.4.68 | 2038629444 | 0 |
| 121.131.4.69 | 2038629445 | 0 |
| 121.131.4.70 | 2038629446 | 0 |
| 121.131.4.71 | 2038629447 | 0 |
| 121.131.4.72 | 2038629448 | 0 |
| 121.131.4.73 | 2038629449 | 0 |
| 121.131.4.74 | 2038629450 | 0 |
| 121.131.4.75 | 2038629451 | 0 |
| 121.131.4.76 | 2038629452 | 0 |
| 121.131.4.77 | 2038629453 | 0 |
| 121.131.4.78 | 2038629454 | 0 |
| 121.131.4.79 | 2038629455 | 0 |
| 121.131.4.80 | 2038629456 | 0 |
| 121.131.4.81 | 2038629457 | 0 |
| 121.131.4.82 | 2038629458 | 0 |
| 121.131.4.83 | 2038629459 | 0 |
| 121.131.4.84 | 2038629460 | 0 |
| 121.131.4.85 | 2038629461 | 0 |