Les adresses IP débutant par 145.91.81 sont fournies par SURFnet, elles appartiennent au CIDR (Classless Inter-Domain Routing) 145.91.0.0/16, le bloc IP comprant les adresses de 145.91.0.0 à 145.91.255.255). Le numéro de système autonome (ASN) est 1103.
| ASN | 1103 |
| IP commençant par | 145.91.0.0 |
| IP se terminant par | 145.91.255.255 |
| Nom ASN | SURFnet |
| CDIR | 145.91.0.0/16 |
| IP numérique | |
| Registe | ripencc |
| Dernière mise à jour | 15/05/2019 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | NL | Pays-Bas | - | Maastricht | 50,8483 | 5,6889 | 2019-05-14 |
| MaxMind | NL | Pays-Bas | - | Weert | 51,2409 | 5,6998 | 2019-05-14 |
| Whois | NL | - | - | - | 5 | 52 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 145.91.81.0 | 2438680832 | 0 |
| 145.91.81.1 | 2438680833 | 0 |
| 145.91.81.2 | 2438680834 | 0 |
| 145.91.81.3 | 2438680835 | 0 |
| 145.91.81.4 | 2438680836 | 0 |
| 145.91.81.5 | 2438680837 | 0 |
| 145.91.81.6 | 2438680838 | 0 |
| 145.91.81.7 | 2438680839 | 0 |
| 145.91.81.8 | 2438680840 | 0 |
| 145.91.81.9 | 2438680841 | 0 |
| 145.91.81.10 | 2438680842 | 0 |
| 145.91.81.11 | 2438680843 | 0 |
| 145.91.81.12 | 2438680844 | 0 |
| 145.91.81.13 | 2438680845 | 0 |
| 145.91.81.14 | 2438680846 | 0 |
| 145.91.81.15 | 2438680847 | 0 |
| 145.91.81.16 | 2438680848 | 0 |
| 145.91.81.17 | 2438680849 | 0 |
| 145.91.81.18 | 2438680850 | 0 |
| 145.91.81.19 | 2438680851 | 0 |
| 145.91.81.20 | 2438680852 | 0 |
| 145.91.81.21 | 2438680853 | 0 |
| 145.91.81.22 | 2438680854 | 0 |
| 145.91.81.23 | 2438680855 | 0 |
| 145.91.81.24 | 2438680856 | 0 |
| 145.91.81.25 | 2438680857 | 0 |
| 145.91.81.26 | 2438680858 | 0 |
| 145.91.81.27 | 2438680859 | 0 |
| 145.91.81.28 | 2438680860 | 0 |
| 145.91.81.29 | 2438680861 | 0 |
| 145.91.81.30 | 2438680862 | 0 |
| 145.91.81.31 | 2438680863 | 0 |
| 145.91.81.32 | 2438680864 | 0 |
| 145.91.81.33 | 2438680865 | 0 |
| 145.91.81.34 | 2438680866 | 0 |
| 145.91.81.35 | 2438680867 | 0 |
| 145.91.81.36 | 2438680868 | 0 |
| 145.91.81.37 | 2438680869 | 0 |
| 145.91.81.38 | 2438680870 | 0 |
| 145.91.81.39 | 2438680871 | 0 |
| 145.91.81.40 | 2438680872 | 0 |
| 145.91.81.41 | 2438680873 | 0 |
| 145.91.81.42 | 2438680874 | 0 |
| 145.91.81.43 | 2438680875 | 0 |
| 145.91.81.44 | 2438680876 | 0 |
| 145.91.81.45 | 2438680877 | 0 |
| 145.91.81.46 | 2438680878 | 0 |
| 145.91.81.47 | 2438680879 | 0 |
| 145.91.81.48 | 2438680880 | 0 |
| 145.91.81.49 | 2438680881 | 0 |
| 145.91.81.50 | 2438680882 | 0 |
| 145.91.81.51 | 2438680883 | 0 |
| 145.91.81.52 | 2438680884 | 0 |
| 145.91.81.53 | 2438680885 | 0 |
| 145.91.81.54 | 2438680886 | 0 |
| 145.91.81.55 | 2438680887 | 0 |
| 145.91.81.56 | 2438680888 | 0 |
| 145.91.81.57 | 2438680889 | 0 |
| 145.91.81.58 | 2438680890 | 0 |
| 145.91.81.59 | 2438680891 | 0 |
| 145.91.81.60 | 2438680892 | 0 |
| 145.91.81.61 | 2438680893 | 0 |
| 145.91.81.62 | 2438680894 | 0 |
| 145.91.81.63 | 2438680895 | 0 |
| 145.91.81.64 | 2438680896 | 0 |
| 145.91.81.65 | 2438680897 | 0 |
| 145.91.81.66 | 2438680898 | 0 |
| 145.91.81.67 | 2438680899 | 0 |
| 145.91.81.68 | 2438680900 | 0 |
| 145.91.81.69 | 2438680901 | 0 |
| 145.91.81.70 | 2438680902 | 0 |
| 145.91.81.71 | 2438680903 | 0 |
| 145.91.81.72 | 2438680904 | 0 |
| 145.91.81.73 | 2438680905 | 0 |
| 145.91.81.74 | 2438680906 | 0 |
| 145.91.81.75 | 2438680907 | 0 |
| 145.91.81.76 | 2438680908 | 0 |
| 145.91.81.77 | 2438680909 | 0 |
| 145.91.81.78 | 2438680910 | 0 |
| 145.91.81.79 | 2438680911 | 0 |
| 145.91.81.80 | 2438680912 | 0 |
| 145.91.81.81 | 2438680913 | 0 |
| 145.91.81.82 | 2438680914 | 0 |
| 145.91.81.83 | 2438680915 | 0 |
| 145.91.81.84 | 2438680916 | 0 |
| 145.91.81.85 | 2438680917 | 0 |