The IP address 42.12.21 is provided by SK Telecom, it's belong to the CDIR (Classless Inter-Domain Routing) 42.16.0.0/12 (range 42.16.0.0 to 42.31.255.255). The autonomous system number (ASN) is 9644.
| ASN | 9644 |
| IP starting by | 42.16.0.0 |
| IP ending by | 42.31.255.255 |
| ASN Name | SK Telecom |
| CDIR | 42.16.0.0/12 |
| Numerical IP | |
| Registry | apnic |
| Last update | 10/09/2017 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | KR | South Korea | - | Seoul | 37.5683 | 126.9778 | 2017-09-10 |
| MaxMind | KR | South Korea | - | - | 37.5112 | 126.9741 | 2017-09-10 |
| Whois | KR | - | - | - | 128 | 36 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 42.12.21.0 | 705434880 | 0 |
| 42.12.21.1 | 705434881 | 0 |
| 42.12.21.2 | 705434882 | 0 |
| 42.12.21.3 | 705434883 | 0 |
| 42.12.21.4 | 705434884 | 0 |
| 42.12.21.5 | 705434885 | 0 |
| 42.12.21.6 | 705434886 | 0 |
| 42.12.21.7 | 705434887 | 0 |
| 42.12.21.8 | 705434888 | 0 |
| 42.12.21.9 | 705434889 | 0 |
| 42.12.21.10 | 705434890 | 0 |
| 42.12.21.11 | 705434891 | 0 |
| 42.12.21.12 | 705434892 | 0 |
| 42.12.21.13 | 705434893 | 0 |
| 42.12.21.14 | 705434894 | 0 |
| 42.12.21.15 | 705434895 | 0 |
| 42.12.21.16 | 705434896 | 0 |
| 42.12.21.17 | 705434897 | 0 |
| 42.12.21.18 | 705434898 | 0 |
| 42.12.21.19 | 705434899 | 0 |
| 42.12.21.20 | 705434900 | 0 |
| 42.12.21.21 | 705434901 | 0 |
| 42.12.21.22 | 705434902 | 0 |
| 42.12.21.23 | 705434903 | 0 |
| 42.12.21.24 | 705434904 | 0 |
| 42.12.21.25 | 705434905 | 0 |
| 42.12.21.26 | 705434906 | 0 |
| 42.12.21.27 | 705434907 | 0 |
| 42.12.21.28 | 705434908 | 0 |
| 42.12.21.29 | 705434909 | 0 |
| 42.12.21.30 | 705434910 | 0 |
| 42.12.21.31 | 705434911 | 0 |
| 42.12.21.32 | 705434912 | 0 |
| 42.12.21.33 | 705434913 | 0 |
| 42.12.21.34 | 705434914 | 0 |
| 42.12.21.35 | 705434915 | 0 |
| 42.12.21.36 | 705434916 | 0 |
| 42.12.21.37 | 705434917 | 0 |
| 42.12.21.38 | 705434918 | 0 |
| 42.12.21.39 | 705434919 | 0 |
| 42.12.21.40 | 705434920 | 0 |
| 42.12.21.41 | 705434921 | 0 |
| 42.12.21.42 | 705434922 | 0 |
| 42.12.21.43 | 705434923 | 0 |
| 42.12.21.44 | 705434924 | 0 |
| 42.12.21.45 | 705434925 | 0 |
| 42.12.21.46 | 705434926 | 0 |
| 42.12.21.47 | 705434927 | 0 |
| 42.12.21.48 | 705434928 | 0 |
| 42.12.21.49 | 705434929 | 0 |
| 42.12.21.50 | 705434930 | 0 |
| 42.12.21.51 | 705434931 | 0 |
| 42.12.21.52 | 705434932 | 0 |
| 42.12.21.53 | 705434933 | 0 |
| 42.12.21.54 | 705434934 | 0 |
| 42.12.21.55 | 705434935 | 0 |
| 42.12.21.56 | 705434936 | 0 |
| 42.12.21.57 | 705434937 | 0 |
| 42.12.21.58 | 705434938 | 0 |
| 42.12.21.59 | 705434939 | 0 |
| 42.12.21.60 | 705434940 | 0 |
| 42.12.21.61 | 705434941 | 0 |
| 42.12.21.62 | 705434942 | 0 |
| 42.12.21.63 | 705434943 | 0 |
| 42.12.21.64 | 705434944 | 0 |
| 42.12.21.65 | 705434945 | 0 |
| 42.12.21.66 | 705434946 | 0 |
| 42.12.21.67 | 705434947 | 0 |
| 42.12.21.68 | 705434948 | 0 |
| 42.12.21.69 | 705434949 | 0 |
| 42.12.21.70 | 705434950 | 0 |
| 42.12.21.71 | 705434951 | 0 |
| 42.12.21.72 | 705434952 | 0 |
| 42.12.21.73 | 705434953 | 0 |
| 42.12.21.74 | 705434954 | 0 |
| 42.12.21.75 | 705434955 | 0 |
| 42.12.21.76 | 705434956 | 0 |
| 42.12.21.77 | 705434957 | 0 |
| 42.12.21.78 | 705434958 | 0 |
| 42.12.21.79 | 705434959 | 0 |
| 42.12.21.80 | 705434960 | 0 |
| 42.12.21.81 | 705434961 | 0 |
| 42.12.21.82 | 705434962 | 0 |
| 42.12.21.83 | 705434963 | 0 |
| 42.12.21.84 | 705434964 | 0 |
| 42.12.21.85 | 705434965 | 0 |