Les adresses IP débutant par 121.129.3 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 | 20/07/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | KR | Korea, Republic of | - | Seoul | 37,5683 | 126,9778 | 2017-07-20 |
| MaxMind | KR | Corée du Sud | - | Seoul | 37,5111 | 126,9743 | 2017-07-20 |
| Whois | KR | - | - | - | 128 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 121.129.3.0 | 2038498048 | 0 |
| 121.129.3.1 | 2038498049 | 0 |
| 121.129.3.2 | 2038498050 | 0 |
| 121.129.3.3 | 2038498051 | 0 |
| 121.129.3.4 | 2038498052 | 0 |
| 121.129.3.5 | 2038498053 | 0 |
| 121.129.3.6 | 2038498054 | 0 |
| 121.129.3.7 | 2038498055 | 0 |
| 121.129.3.8 | 2038498056 | 0 |
| 121.129.3.9 | 2038498057 | 0 |
| 121.129.3.10 | 2038498058 | 0 |
| 121.129.3.11 | 2038498059 | 0 |
| 121.129.3.12 | 2038498060 | 0 |
| 121.129.3.13 | 2038498061 | 0 |
| 121.129.3.14 | 2038498062 | 0 |
| 121.129.3.15 | 2038498063 | 0 |
| 121.129.3.16 | 2038498064 | 0 |
| 121.129.3.17 | 2038498065 | 0 |
| 121.129.3.18 | 2038498066 | 0 |
| 121.129.3.19 | 2038498067 | 0 |
| 121.129.3.20 | 2038498068 | 0 |
| 121.129.3.21 | 2038498069 | 0 |
| 121.129.3.22 | 2038498070 | 0 |
| 121.129.3.23 | 2038498071 | 0 |
| 121.129.3.24 | 2038498072 | 0 |
| 121.129.3.25 | 2038498073 | 0 |
| 121.129.3.26 | 2038498074 | 0 |
| 121.129.3.27 | 2038498075 | 0 |
| 121.129.3.28 | 2038498076 | 0 |
| 121.129.3.29 | 2038498077 | 0 |
| 121.129.3.30 | 2038498078 | 0 |
| 121.129.3.31 | 2038498079 | 0 |
| 121.129.3.32 | 2038498080 | 0 |
| 121.129.3.33 | 2038498081 | 0 |
| 121.129.3.34 | 2038498082 | 0 |
| 121.129.3.35 | 2038498083 | 0 |
| 121.129.3.36 | 2038498084 | 0 |
| 121.129.3.37 | 2038498085 | 0 |
| 121.129.3.38 | 2038498086 | 0 |
| 121.129.3.39 | 2038498087 | 0 |
| 121.129.3.40 | 2038498088 | 0 |
| 121.129.3.41 | 2038498089 | 0 |
| 121.129.3.42 | 2038498090 | 0 |
| 121.129.3.43 | 2038498091 | 0 |
| 121.129.3.44 | 2038498092 | 0 |
| 121.129.3.45 | 2038498093 | 0 |
| 121.129.3.46 | 2038498094 | 0 |
| 121.129.3.47 | 2038498095 | 0 |
| 121.129.3.48 | 2038498096 | 0 |
| 121.129.3.49 | 2038498097 | 0 |
| 121.129.3.50 | 2038498098 | 0 |
| 121.129.3.51 | 2038498099 | 0 |
| 121.129.3.52 | 2038498100 | 0 |
| 121.129.3.53 | 2038498101 | 0 |
| 121.129.3.54 | 2038498102 | 0 |
| 121.129.3.55 | 2038498103 | 0 |
| 121.129.3.56 | 2038498104 | 0 |
| 121.129.3.57 | 2038498105 | 0 |
| 121.129.3.58 | 2038498106 | 0 |
| 121.129.3.59 | 2038498107 | 0 |
| 121.129.3.60 | 2038498108 | 0 |
| 121.129.3.61 | 2038498109 | 0 |
| 121.129.3.62 | 2038498110 | 0 |
| 121.129.3.63 | 2038498111 | 0 |
| 121.129.3.64 | 2038498112 | 0 |
| 121.129.3.65 | 2038498113 | 0 |
| 121.129.3.66 | 2038498114 | 0 |
| 121.129.3.67 | 2038498115 | 0 |
| 121.129.3.68 | 2038498116 | 0 |
| 121.129.3.69 | 2038498117 | 0 |
| 121.129.3.70 | 2038498118 | 0 |
| 121.129.3.71 | 2038498119 | 0 |
| 121.129.3.72 | 2038498120 | 0 |
| 121.129.3.73 | 2038498121 | 0 |
| 121.129.3.74 | 2038498122 | 0 |
| 121.129.3.75 | 2038498123 | 0 |
| 121.129.3.76 | 2038498124 | 0 |
| 121.129.3.77 | 2038498125 | 0 |
| 121.129.3.78 | 2038498126 | 0 |
| 121.129.3.79 | 2038498127 | 0 |
| 121.129.3.80 | 2038498128 | 0 |
| 121.129.3.81 | 2038498129 | 0 |
| 121.129.3.82 | 2038498130 | 0 |
| 121.129.3.83 | 2038498131 | 0 |
| 121.129.3.84 | 2038498132 | 0 |
| 121.129.3.85 | 2038498133 | 0 |