Les adresses IP débutant par 137.56.99 sont fournies par SURFnet, elles appartiennent au CIDR (Classless Inter-Domain Routing) 137.56.0.0/16, le bloc IP comprant les adresses de 137.56.0.0 à 137.56.255.255). Le numéro de système autonome (ASN) est 1103.
| ASN | 1103 |
| IP commençant par | 137.56.0.0 |
| IP se terminant par | 137.56.255.255 |
| Nom ASN | SURFnet |
| CDIR | 137.56.0.0/16 |
| IP numérique | |
| Registe | ripencc |
| Dernière mise à jour | 13/05/2019 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | NL | Pays-Bas | - | Eindhoven | 51,4408 | 5,4778 | 2019-05-12 |
| MaxMind | US | États-Unis | - | San Jose | 37,425 | -121,946 | 2019-05-12 |
| Whois | NL | - | - | - | 5 | 52 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 137.56.99.0 | 2302173952 | 0 |
| 137.56.99.1 | 2302173953 | 0 |
| 137.56.99.2 | 2302173954 | 0 |
| 137.56.99.3 | 2302173955 | 0 |
| 137.56.99.4 | 2302173956 | 0 |
| 137.56.99.5 | 2302173957 | 0 |
| 137.56.99.6 | 2302173958 | 0 |
| 137.56.99.7 | 2302173959 | 0 |
| 137.56.99.8 | 2302173960 | 0 |
| 137.56.99.9 | 2302173961 | 0 |
| 137.56.99.10 | 2302173962 | 0 |
| 137.56.99.11 | 2302173963 | 0 |
| 137.56.99.12 | 2302173964 | 0 |
| 137.56.99.13 | 2302173965 | 0 |
| 137.56.99.14 | 2302173966 | 0 |
| 137.56.99.15 | 2302173967 | 0 |
| 137.56.99.16 | 2302173968 | 0 |
| 137.56.99.17 | 2302173969 | 0 |
| 137.56.99.18 | 2302173970 | 0 |
| 137.56.99.19 | 2302173971 | 0 |
| 137.56.99.20 | 2302173972 | 0 |
| 137.56.99.21 | 2302173973 | 0 |
| 137.56.99.22 | 2302173974 | 0 |
| 137.56.99.23 | 2302173975 | 0 |
| 137.56.99.24 | 2302173976 | 0 |
| 137.56.99.25 | 2302173977 | 0 |
| 137.56.99.26 | 2302173978 | 0 |
| 137.56.99.27 | 2302173979 | 0 |
| 137.56.99.28 | 2302173980 | 0 |
| 137.56.99.29 | 2302173981 | 0 |
| 137.56.99.30 | 2302173982 | 0 |
| 137.56.99.31 | 2302173983 | 0 |
| 137.56.99.32 | 2302173984 | 0 |
| 137.56.99.33 | 2302173985 | 0 |
| 137.56.99.34 | 2302173986 | 0 |
| 137.56.99.35 | 2302173987 | 0 |
| 137.56.99.36 | 2302173988 | 0 |
| 137.56.99.37 | 2302173989 | 0 |
| 137.56.99.38 | 2302173990 | 0 |
| 137.56.99.39 | 2302173991 | 0 |
| 137.56.99.40 | 2302173992 | 0 |
| 137.56.99.41 | 2302173993 | 0 |
| 137.56.99.42 | 2302173994 | 0 |
| 137.56.99.43 | 2302173995 | 0 |
| 137.56.99.44 | 2302173996 | 0 |
| 137.56.99.45 | 2302173997 | 0 |
| 137.56.99.46 | 2302173998 | 0 |
| 137.56.99.47 | 2302173999 | 0 |
| 137.56.99.48 | 2302174000 | 0 |
| 137.56.99.49 | 2302174001 | 0 |
| 137.56.99.50 | 2302174002 | 0 |
| 137.56.99.51 | 2302174003 | 0 |
| 137.56.99.52 | 2302174004 | 0 |
| 137.56.99.53 | 2302174005 | 0 |
| 137.56.99.54 | 2302174006 | 0 |
| 137.56.99.55 | 2302174007 | 0 |
| 137.56.99.56 | 2302174008 | 0 |
| 137.56.99.57 | 2302174009 | 0 |
| 137.56.99.58 | 2302174010 | 0 |
| 137.56.99.59 | 2302174011 | 0 |
| 137.56.99.60 | 2302174012 | 0 |
| 137.56.99.61 | 2302174013 | 0 |
| 137.56.99.62 | 2302174014 | 0 |
| 137.56.99.63 | 2302174015 | 0 |
| 137.56.99.64 | 2302174016 | 0 |
| 137.56.99.65 | 2302174017 | 0 |
| 137.56.99.66 | 2302174018 | 0 |
| 137.56.99.67 | 2302174019 | 0 |
| 137.56.99.68 | 2302174020 | 0 |
| 137.56.99.69 | 2302174021 | 0 |
| 137.56.99.70 | 2302174022 | 0 |
| 137.56.99.71 | 2302174023 | 0 |
| 137.56.99.72 | 2302174024 | 0 |
| 137.56.99.73 | 2302174025 | 0 |
| 137.56.99.74 | 2302174026 | 0 |
| 137.56.99.75 | 2302174027 | 0 |
| 137.56.99.76 | 2302174028 | 0 |
| 137.56.99.77 | 2302174029 | 0 |
| 137.56.99.78 | 2302174030 | 0 |
| 137.56.99.79 | 2302174031 | 0 |
| 137.56.99.80 | 2302174032 | 0 |
| 137.56.99.81 | 2302174033 | 0 |
| 137.56.99.82 | 2302174034 | 0 |
| 137.56.99.83 | 2302174035 | 0 |
| 137.56.99.84 | 2302174036 | 0 |
| 137.56.99.85 | 2302174037 | 0 |