Les adresses IP débutant par 121.136.4 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 | 17/04/2019 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | KR | Corée du Sud | - | Seongnam | 37,4386 | 127,1378 | 2019-04-17 |
| MaxMind | KR | Corée du Sud | - | Suwon-si | 37,2911 | 127,0089 | 2019-04-17 |
| Whois | KR | - | - | - | 128 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.136.4.0 | 2038957056 | 0 |
| 121.136.4.1 | 2038957057 | 0 |
| 121.136.4.2 | 2038957058 | 0 |
| 121.136.4.3 | 2038957059 | 0 |
| 121.136.4.4 | 2038957060 | 0 |
| 121.136.4.5 | 2038957061 | 0 |
| 121.136.4.6 | 2038957062 | 0 |
| 121.136.4.7 | 2038957063 | 0 |
| 121.136.4.8 | 2038957064 | 0 |
| 121.136.4.9 | 2038957065 | 0 |
| 121.136.4.10 | 2038957066 | 0 |
| 121.136.4.11 | 2038957067 | 0 |
| 121.136.4.12 | 2038957068 | 0 |
| 121.136.4.13 | 2038957069 | 0 |
| 121.136.4.14 | 2038957070 | 0 |
| 121.136.4.15 | 2038957071 | 0 |
| 121.136.4.16 | 2038957072 | 0 |
| 121.136.4.17 | 2038957073 | 0 |
| 121.136.4.18 | 2038957074 | 0 |
| 121.136.4.19 | 2038957075 | 0 |
| 121.136.4.20 | 2038957076 | 0 |
| 121.136.4.21 | 2038957077 | 0 |
| 121.136.4.22 | 2038957078 | 0 |
| 121.136.4.23 | 2038957079 | 0 |
| 121.136.4.24 | 2038957080 | 0 |
| 121.136.4.25 | 2038957081 | 0 |
| 121.136.4.26 | 2038957082 | 0 |
| 121.136.4.27 | 2038957083 | 0 |
| 121.136.4.28 | 2038957084 | 0 |
| 121.136.4.29 | 2038957085 | 0 |
| 121.136.4.30 | 2038957086 | 0 |
| 121.136.4.31 | 2038957087 | 0 |
| 121.136.4.32 | 2038957088 | 0 |
| 121.136.4.33 | 2038957089 | 0 |
| 121.136.4.34 | 2038957090 | 0 |
| 121.136.4.35 | 2038957091 | 0 |
| 121.136.4.36 | 2038957092 | 0 |
| 121.136.4.37 | 2038957093 | 0 |
| 121.136.4.38 | 2038957094 | 0 |
| 121.136.4.39 | 2038957095 | 0 |
| 121.136.4.40 | 2038957096 | 0 |
| 121.136.4.41 | 2038957097 | 0 |
| 121.136.4.42 | 2038957098 | 0 |
| 121.136.4.43 | 2038957099 | 0 |
| 121.136.4.44 | 2038957100 | 0 |
| 121.136.4.45 | 2038957101 | 0 |
| 121.136.4.46 | 2038957102 | 0 |
| 121.136.4.47 | 2038957103 | 0 |
| 121.136.4.48 | 2038957104 | 0 |
| 121.136.4.49 | 2038957105 | 0 |
| 121.136.4.50 | 2038957106 | 0 |
| 121.136.4.51 | 2038957107 | 0 |
| 121.136.4.52 | 2038957108 | 0 |
| 121.136.4.53 | 2038957109 | 0 |
| 121.136.4.54 | 2038957110 | 0 |
| 121.136.4.55 | 2038957111 | 0 |
| 121.136.4.56 | 2038957112 | 0 |
| 121.136.4.57 | 2038957113 | 0 |
| 121.136.4.58 | 2038957114 | 0 |
| 121.136.4.59 | 2038957115 | 0 |
| 121.136.4.60 | 2038957116 | 0 |
| 121.136.4.61 | 2038957117 | 0 |
| 121.136.4.62 | 2038957118 | 0 |
| 121.136.4.63 | 2038957119 | 0 |
| 121.136.4.64 | 2038957120 | 0 |
| 121.136.4.65 | 2038957121 | 0 |
| 121.136.4.66 | 2038957122 | 0 |
| 121.136.4.67 | 2038957123 | 0 |
| 121.136.4.68 | 2038957124 | 0 |
| 121.136.4.69 | 2038957125 | 0 |
| 121.136.4.70 | 2038957126 | 0 |
| 121.136.4.71 | 2038957127 | 0 |
| 121.136.4.72 | 2038957128 | 0 |
| 121.136.4.73 | 2038957129 | 0 |
| 121.136.4.74 | 2038957130 | 0 |
| 121.136.4.75 | 2038957131 | 0 |
| 121.136.4.76 | 2038957132 | 0 |
| 121.136.4.77 | 2038957133 | 0 |
| 121.136.4.78 | 2038957134 | 0 |
| 121.136.4.79 | 2038957135 | 0 |
| 121.136.4.80 | 2038957136 | 0 |
| 121.136.4.81 | 2038957137 | 0 |
| 121.136.4.82 | 2038957138 | 0 |
| 121.136.4.83 | 2038957139 | 0 |
| 121.136.4.84 | 2038957140 | 0 |
| 121.136.4.85 | 2038957141 | 0 |