Les adresses IP débutant par 121.155.5 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 | 11/01/2018 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | KR | Corée du Sud | - | Kang-neung | 37,7556 | 128,8961 | 2018-01-11 |
| MaxMind | KR | Corée du Sud | - | - | 37,2342 | 127,2064 | 2018-01-11 |
| Whois | KR | - | - | - | 128 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.155.5.0 | 2040202496 | 0 |
| 121.155.5.1 | 2040202497 | 0 |
| 121.155.5.2 | 2040202498 | 0 |
| 121.155.5.3 | 2040202499 | 0 |
| 121.155.5.4 | 2040202500 | 0 |
| 121.155.5.5 | 2040202501 | 0 |
| 121.155.5.6 | 2040202502 | 0 |
| 121.155.5.7 | 2040202503 | 0 |
| 121.155.5.8 | 2040202504 | 0 |
| 121.155.5.9 | 2040202505 | 0 |
| 121.155.5.10 | 2040202506 | 0 |
| 121.155.5.11 | 2040202507 | 0 |
| 121.155.5.12 | 2040202508 | 0 |
| 121.155.5.13 | 2040202509 | 0 |
| 121.155.5.14 | 2040202510 | 0 |
| 121.155.5.15 | 2040202511 | 0 |
| 121.155.5.16 | 2040202512 | 0 |
| 121.155.5.17 | 2040202513 | 0 |
| 121.155.5.18 | 2040202514 | 0 |
| 121.155.5.19 | 2040202515 | 0 |
| 121.155.5.20 | 2040202516 | 0 |
| 121.155.5.21 | 2040202517 | 0 |
| 121.155.5.22 | 2040202518 | 0 |
| 121.155.5.23 | 2040202519 | 0 |
| 121.155.5.24 | 2040202520 | 0 |
| 121.155.5.25 | 2040202521 | 0 |
| 121.155.5.26 | 2040202522 | 0 |
| 121.155.5.27 | 2040202523 | 0 |
| 121.155.5.28 | 2040202524 | 0 |
| 121.155.5.29 | 2040202525 | 0 |
| 121.155.5.30 | 2040202526 | 0 |
| 121.155.5.31 | 2040202527 | 0 |
| 121.155.5.32 | 2040202528 | 0 |
| 121.155.5.33 | 2040202529 | 0 |
| 121.155.5.34 | 2040202530 | 0 |
| 121.155.5.35 | 2040202531 | 0 |
| 121.155.5.36 | 2040202532 | 0 |
| 121.155.5.37 | 2040202533 | 0 |
| 121.155.5.38 | 2040202534 | 0 |
| 121.155.5.39 | 2040202535 | 0 |
| 121.155.5.40 | 2040202536 | 0 |
| 121.155.5.41 | 2040202537 | 0 |
| 121.155.5.42 | 2040202538 | 0 |
| 121.155.5.43 | 2040202539 | 0 |
| 121.155.5.44 | 2040202540 | 0 |
| 121.155.5.45 | 2040202541 | 0 |
| 121.155.5.46 | 2040202542 | 0 |
| 121.155.5.47 | 2040202543 | 0 |
| 121.155.5.48 | 2040202544 | 0 |
| 121.155.5.49 | 2040202545 | 0 |
| 121.155.5.50 | 2040202546 | 0 |
| 121.155.5.51 | 2040202547 | 0 |
| 121.155.5.52 | 2040202548 | 0 |
| 121.155.5.53 | 2040202549 | 0 |
| 121.155.5.54 | 2040202550 | 0 |
| 121.155.5.55 | 2040202551 | 0 |
| 121.155.5.56 | 2040202552 | 0 |
| 121.155.5.57 | 2040202553 | 0 |
| 121.155.5.58 | 2040202554 | 0 |
| 121.155.5.59 | 2040202555 | 0 |
| 121.155.5.60 | 2040202556 | 0 |
| 121.155.5.61 | 2040202557 | 0 |
| 121.155.5.62 | 2040202558 | 0 |
| 121.155.5.63 | 2040202559 | 0 |
| 121.155.5.64 | 2040202560 | 0 |
| 121.155.5.65 | 2040202561 | 0 |
| 121.155.5.66 | 2040202562 | 0 |
| 121.155.5.67 | 2040202563 | 0 |
| 121.155.5.68 | 2040202564 | 0 |
| 121.155.5.69 | 2040202565 | 0 |
| 121.155.5.70 | 2040202566 | 0 |
| 121.155.5.71 | 2040202567 | 0 |
| 121.155.5.72 | 2040202568 | 0 |
| 121.155.5.73 | 2040202569 | 0 |
| 121.155.5.74 | 2040202570 | 0 |
| 121.155.5.75 | 2040202571 | 0 |
| 121.155.5.76 | 2040202572 | 0 |
| 121.155.5.77 | 2040202573 | 0 |
| 121.155.5.78 | 2040202574 | 0 |
| 121.155.5.79 | 2040202575 | 0 |
| 121.155.5.80 | 2040202576 | 0 |
| 121.155.5.81 | 2040202577 | 0 |
| 121.155.5.82 | 2040202578 | 0 |
| 121.155.5.83 | 2040202579 | 0 |
| 121.155.5.84 | 2040202580 | 0 |
| 121.155.5.85 | 2040202581 | 0 |