Les adresses IP débutant par 81.158.40 sont fournies par BTnet UK Regional network, elles appartiennent au CIDR (Classless Inter-Domain Routing) 81.128.0.0/11, le bloc IP comprant les adresses de 81.128.0.0 à 81.159.255.255). Le numéro de système autonome (ASN) est 2856.
| ASN | 2856 |
| IP commençant par | 81.128.0.0 |
| IP se terminant par | 81.159.255.255 |
| Nom ASN | BTnet UK Regional network |
| CDIR | 81.128.0.0/11 |
| IP numérique | |
| Registe | ripencc |
| Dernière mise à jour | 05/08/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | GB | Royaume-Uni | - | Ulsta | 60,5 | -1,15 | 2017-08-05 |
| MaxMind | GB | Royaume-Uni | - | - | 51,4964 | -0,1224 | 2017-08-05 |
| Whois | GB | - | - | - | -3 | 55 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 81.158.40.0 | 1369319424 | 0 |
| 81.158.40.1 | 1369319425 | 0 |
| 81.158.40.2 | 1369319426 | 0 |
| 81.158.40.3 | 1369319427 | 0 |
| 81.158.40.4 | 1369319428 | 0 |
| 81.158.40.5 | 1369319429 | 0 |
| 81.158.40.6 | 1369319430 | 0 |
| 81.158.40.7 | 1369319431 | 0 |
| 81.158.40.8 | 1369319432 | 0 |
| 81.158.40.9 | 1369319433 | 0 |
| 81.158.40.10 | 1369319434 | 0 |
| 81.158.40.11 | 1369319435 | 0 |
| 81.158.40.12 | 1369319436 | 0 |
| 81.158.40.13 | 1369319437 | 0 |
| 81.158.40.14 | 1369319438 | 0 |
| 81.158.40.15 | 1369319439 | 0 |
| 81.158.40.16 | 1369319440 | 0 |
| 81.158.40.17 | 1369319441 | 0 |
| 81.158.40.18 | 1369319442 | 0 |
| 81.158.40.19 | 1369319443 | 0 |
| 81.158.40.20 | 1369319444 | 0 |
| 81.158.40.21 | 1369319445 | 0 |
| 81.158.40.22 | 1369319446 | 0 |
| 81.158.40.23 | 1369319447 | 0 |
| 81.158.40.24 | 1369319448 | 0 |
| 81.158.40.25 | 1369319449 | 0 |
| 81.158.40.26 | 1369319450 | 0 |
| 81.158.40.27 | 1369319451 | 0 |
| 81.158.40.28 | 1369319452 | 0 |
| 81.158.40.29 | 1369319453 | 0 |
| 81.158.40.30 | 1369319454 | 0 |
| 81.158.40.31 | 1369319455 | 0 |
| 81.158.40.32 | 1369319456 | 0 |
| 81.158.40.33 | 1369319457 | 0 |
| 81.158.40.34 | 1369319458 | 0 |
| 81.158.40.35 | 1369319459 | 0 |
| 81.158.40.36 | 1369319460 | 0 |
| 81.158.40.37 | 1369319461 | 0 |
| 81.158.40.38 | 1369319462 | 0 |
| 81.158.40.39 | 1369319463 | 0 |
| 81.158.40.40 | 1369319464 | 0 |
| 81.158.40.41 | 1369319465 | 0 |
| 81.158.40.42 | 1369319466 | 0 |
| 81.158.40.43 | 1369319467 | 0 |
| 81.158.40.44 | 1369319468 | 0 |
| 81.158.40.45 | 1369319469 | 0 |
| 81.158.40.46 | 1369319470 | 0 |
| 81.158.40.47 | 1369319471 | 0 |
| 81.158.40.48 | 1369319472 | 0 |
| 81.158.40.49 | 1369319473 | 0 |
| 81.158.40.50 | 1369319474 | 0 |
| 81.158.40.51 | 1369319475 | 0 |
| 81.158.40.52 | 1369319476 | 0 |
| 81.158.40.53 | 1369319477 | 0 |
| 81.158.40.54 | 1369319478 | 0 |
| 81.158.40.55 | 1369319479 | 0 |
| 81.158.40.56 | 1369319480 | 0 |
| 81.158.40.57 | 1369319481 | 0 |
| 81.158.40.58 | 1369319482 | 0 |
| 81.158.40.59 | 1369319483 | 0 |
| 81.158.40.60 | 1369319484 | 0 |
| 81.158.40.61 | 1369319485 | 0 |
| 81.158.40.62 | 1369319486 | 0 |
| 81.158.40.63 | 1369319487 | 0 |
| 81.158.40.64 | 1369319488 | 0 |
| 81.158.40.65 | 1369319489 | 0 |
| 81.158.40.66 | 1369319490 | 0 |
| 81.158.40.67 | 1369319491 | 0 |
| 81.158.40.68 | 1369319492 | 0 |
| 81.158.40.69 | 1369319493 | 0 |
| 81.158.40.70 | 1369319494 | 0 |
| 81.158.40.71 | 1369319495 | 0 |
| 81.158.40.72 | 1369319496 | 0 |
| 81.158.40.73 | 1369319497 | 0 |
| 81.158.40.74 | 1369319498 | 0 |
| 81.158.40.75 | 1369319499 | 0 |
| 81.158.40.76 | 1369319500 | 0 |
| 81.158.40.77 | 1369319501 | 0 |
| 81.158.40.78 | 1369319502 | 0 |
| 81.158.40.79 | 1369319503 | 0 |
| 81.158.40.80 | 1369319504 | 0 |
| 81.158.40.81 | 1369319505 | 0 |
| 81.158.40.82 | 1369319506 | 0 |
| 81.158.40.83 | 1369319507 | 0 |
| 81.158.40.84 | 1369319508 | 0 |
| 81.158.40.85 | 1369319509 | 0 |