Les adresses IP débutant par 5.81.64 sont fournies par BTnet UK Regional network, elles appartiennent au CIDR (Classless Inter-Domain Routing) 5.80.0.0/15, le bloc IP comprant les adresses de 5.80.0.0 à 5.81.255.255). Le numéro de système autonome (ASN) est 2856.
| ASN | 2856 |
| IP commençant par | 5.80.0.0 |
| IP se terminant par | 5.81.255.255 |
| Nom ASN | BTnet UK Regional network |
| CDIR | 5.80.0.0/15 |
| IP numérique | |
| Registe | ripencc |
| Dernière mise à jour | 24/09/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | GB | Royaume-Uni | - | Great Clacton | 51,8046 | 1,1547 | 2017-10-03 |
| MaxMind | GB | Royaume-Uni | - | Clacton-on-Sea | 51,7897 | 1,156 | 2017-10-03 |
| Whois | GB | - | - | - | -3 | 55 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 5.81.64.0 | 89210880 | 0 |
| 5.81.64.1 | 89210881 | 0 |
| 5.81.64.2 | 89210882 | 0 |
| 5.81.64.3 | 89210883 | 0 |
| 5.81.64.4 | 89210884 | 0 |
| 5.81.64.5 | 89210885 | 0 |
| 5.81.64.6 | 89210886 | 0 |
| 5.81.64.7 | 89210887 | 0 |
| 5.81.64.8 | 89210888 | 0 |
| 5.81.64.9 | 89210889 | 0 |
| 5.81.64.10 | 89210890 | 0 |
| 5.81.64.11 | 89210891 | 0 |
| 5.81.64.12 | 89210892 | 0 |
| 5.81.64.13 | 89210893 | 0 |
| 5.81.64.14 | 89210894 | 0 |
| 5.81.64.15 | 89210895 | 0 |
| 5.81.64.16 | 89210896 | 0 |
| 5.81.64.17 | 89210897 | 0 |
| 5.81.64.18 | 89210898 | 0 |
| 5.81.64.19 | 89210899 | 0 |
| 5.81.64.20 | 89210900 | 0 |
| 5.81.64.21 | 89210901 | 0 |
| 5.81.64.22 | 89210902 | 0 |
| 5.81.64.23 | 89210903 | 0 |
| 5.81.64.24 | 89210904 | 0 |
| 5.81.64.25 | 89210905 | 0 |
| 5.81.64.26 | 89210906 | 0 |
| 5.81.64.27 | 89210907 | 0 |
| 5.81.64.28 | 89210908 | 0 |
| 5.81.64.29 | 89210909 | 0 |
| 5.81.64.30 | 89210910 | 0 |
| 5.81.64.31 | 89210911 | 0 |
| 5.81.64.32 | 89210912 | 0 |
| 5.81.64.33 | 89210913 | 0 |
| 5.81.64.34 | 89210914 | 0 |
| 5.81.64.35 | 89210915 | 0 |
| 5.81.64.36 | 89210916 | 0 |
| 5.81.64.37 | 89210917 | 0 |
| 5.81.64.38 | 89210918 | 0 |
| 5.81.64.39 | 89210919 | 0 |
| 5.81.64.40 | 89210920 | 0 |
| 5.81.64.41 | 89210921 | 0 |
| 5.81.64.42 | 89210922 | 0 |
| 5.81.64.43 | 89210923 | 0 |
| 5.81.64.44 | 89210924 | 0 |
| 5.81.64.45 | 89210925 | 0 |
| 5.81.64.46 | 89210926 | 0 |
| 5.81.64.47 | 89210927 | 0 |
| 5.81.64.48 | 89210928 | 0 |
| 5.81.64.49 | 89210929 | 0 |
| 5.81.64.50 | 89210930 | 0 |
| 5.81.64.51 | 89210931 | 0 |
| 5.81.64.52 | 89210932 | 0 |
| 5.81.64.53 | 89210933 | 0 |
| 5.81.64.54 | 89210934 | 0 |
| 5.81.64.55 | 89210935 | 0 |
| 5.81.64.56 | 89210936 | 0 |
| 5.81.64.57 | 89210937 | 0 |
| 5.81.64.58 | 89210938 | 0 |
| 5.81.64.59 | 89210939 | 0 |
| 5.81.64.60 | 89210940 | 0 |
| 5.81.64.61 | 89210941 | 0 |
| 5.81.64.62 | 89210942 | 0 |
| 5.81.64.63 | 89210943 | 0 |
| 5.81.64.64 | 89210944 | 0 |
| 5.81.64.65 | 89210945 | 0 |
| 5.81.64.66 | 89210946 | 0 |
| 5.81.64.67 | 89210947 | 0 |
| 5.81.64.68 | 89210948 | 0 |
| 5.81.64.69 | 89210949 | 0 |
| 5.81.64.70 | 89210950 | 0 |
| 5.81.64.71 | 89210951 | 0 |
| 5.81.64.72 | 89210952 | 0 |
| 5.81.64.73 | 89210953 | 0 |
| 5.81.64.74 | 89210954 | 0 |
| 5.81.64.75 | 89210955 | 0 |
| 5.81.64.76 | 89210956 | 0 |
| 5.81.64.77 | 89210957 | 0 |
| 5.81.64.78 | 89210958 | 0 |
| 5.81.64.79 | 89210959 | 0 |
| 5.81.64.80 | 89210960 | 0 |
| 5.81.64.81 | 89210961 | 0 |
| 5.81.64.82 | 89210962 | 0 |
| 5.81.64.83 | 89210963 | 0 |
| 5.81.64.84 | 89210964 | 0 |
| 5.81.64.85 | 89210965 | 0 |