La dirección IP 145.21.12 es proporcionada por SURFnet, que es propiedad de la CIDR (Classless Inter-Domain Routing) 145.23.0.0/16, IP entre 145.23.0.0 a 145.23.255.255 ). El número de sistema autónomo (ASN) es 1103.
| ASN | 1103 |
| IP que comienzan con | 145.23.0.0 |
| IP que termina con | 145.23.255.255 |
| ASN Nombre | SURFnet |
| CDIR | 145.23.0.0/16 |
| IP numérica | |
| Registe | |
| Última actualización | 30/12/2018 |

| Código País | País | Región | Ciudad | Latitud | Longitud | Última actualización | |
| IP2Location | NL | Países Bajos | - | Dordrecht | 51,81 | 4,6736 | 2018-12-30 |
| MaxMind | NL | Países Bajos | - | Dordrecht | 51,8007 | 4,6982 | 2018-12-30 |
| Whois | NL | - | - | - | 5 | 52 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 145.21.12.0 | 2434075648 | 0 |
| 145.21.12.1 | 2434075649 | 0 |
| 145.21.12.2 | 2434075650 | 0 |
| 145.21.12.3 | 2434075651 | 0 |
| 145.21.12.4 | 2434075652 | 0 |
| 145.21.12.5 | 2434075653 | 0 |
| 145.21.12.6 | 2434075654 | 0 |
| 145.21.12.7 | 2434075655 | 0 |
| 145.21.12.8 | 2434075656 | 0 |
| 145.21.12.9 | 2434075657 | 0 |
| 145.21.12.10 | 2434075658 | 0 |
| 145.21.12.11 | 2434075659 | 0 |
| 145.21.12.12 | 2434075660 | 0 |
| 145.21.12.13 | 2434075661 | 0 |
| 145.21.12.14 | 2434075662 | 0 |
| 145.21.12.15 | 2434075663 | 0 |
| 145.21.12.16 | 2434075664 | 0 |
| 145.21.12.17 | 2434075665 | 0 |
| 145.21.12.18 | 2434075666 | 0 |
| 145.21.12.19 | 2434075667 | 0 |
| 145.21.12.20 | 2434075668 | 0 |
| 145.21.12.21 | 2434075669 | 0 |
| 145.21.12.22 | 2434075670 | 0 |
| 145.21.12.23 | 2434075671 | 0 |
| 145.21.12.24 | 2434075672 | 0 |
| 145.21.12.25 | 2434075673 | 0 |
| 145.21.12.26 | 2434075674 | 0 |
| 145.21.12.27 | 2434075675 | 0 |
| 145.21.12.28 | 2434075676 | 0 |
| 145.21.12.29 | 2434075677 | 0 |
| 145.21.12.30 | 2434075678 | 0 |
| 145.21.12.31 | 2434075679 | 0 |
| 145.21.12.32 | 2434075680 | 0 |
| 145.21.12.33 | 2434075681 | 0 |
| 145.21.12.34 | 2434075682 | 0 |
| 145.21.12.35 | 2434075683 | 0 |
| 145.21.12.36 | 2434075684 | 0 |
| 145.21.12.37 | 2434075685 | 0 |
| 145.21.12.38 | 2434075686 | 0 |
| 145.21.12.39 | 2434075687 | 0 |
| 145.21.12.40 | 2434075688 | 0 |
| 145.21.12.41 | 2434075689 | 0 |
| 145.21.12.42 | 2434075690 | 0 |
| 145.21.12.43 | 2434075691 | 0 |
| 145.21.12.44 | 2434075692 | 0 |
| 145.21.12.45 | 2434075693 | 0 |
| 145.21.12.46 | 2434075694 | 0 |
| 145.21.12.47 | 2434075695 | 0 |
| 145.21.12.48 | 2434075696 | 0 |
| 145.21.12.49 | 2434075697 | 0 |
| 145.21.12.50 | 2434075698 | 0 |
| 145.21.12.51 | 2434075699 | 0 |
| 145.21.12.52 | 2434075700 | 0 |
| 145.21.12.53 | 2434075701 | 0 |
| 145.21.12.54 | 2434075702 | 0 |
| 145.21.12.55 | 2434075703 | 0 |
| 145.21.12.56 | 2434075704 | 0 |
| 145.21.12.57 | 2434075705 | 0 |
| 145.21.12.58 | 2434075706 | 0 |
| 145.21.12.59 | 2434075707 | 0 |
| 145.21.12.60 | 2434075708 | 0 |
| 145.21.12.61 | 2434075709 | 0 |
| 145.21.12.62 | 2434075710 | 0 |
| 145.21.12.63 | 2434075711 | 0 |
| 145.21.12.64 | 2434075712 | 0 |
| 145.21.12.65 | 2434075713 | 0 |
| 145.21.12.66 | 2434075714 | 0 |
| 145.21.12.67 | 2434075715 | 0 |
| 145.21.12.68 | 2434075716 | 0 |
| 145.21.12.69 | 2434075717 | 0 |
| 145.21.12.70 | 2434075718 | 0 |
| 145.21.12.71 | 2434075719 | 0 |
| 145.21.12.72 | 2434075720 | 0 |
| 145.21.12.73 | 2434075721 | 0 |
| 145.21.12.74 | 2434075722 | 0 |
| 145.21.12.75 | 2434075723 | 0 |
| 145.21.12.76 | 2434075724 | 0 |
| 145.21.12.77 | 2434075725 | 0 |
| 145.21.12.78 | 2434075726 | 0 |
| 145.21.12.79 | 2434075727 | 0 |
| 145.21.12.80 | 2434075728 | 0 |
| 145.21.12.81 | 2434075729 | 0 |
| 145.21.12.82 | 2434075730 | 0 |
| 145.21.12.83 | 2434075731 | 0 |
| 145.21.12.84 | 2434075732 | 0 |
| 145.21.12.85 | 2434075733 | 0 |