この記事、「Azure Datacenter IP Ranges」に、2012/2/20現在のWindows Azure DatacenterのIPアドレスレンジが記載されています。（ただし、非公式な情報ですので正確性の保証はありません）
例えば、Window Azure Service Bus Relay Bindingsを使用する場合等では、オンプレミスサーバーから外向きTCP接続を行う必要があります。しかしながら、ネットワーク境界にFirewall等が設置されており、アクセス制限が実施されている場合には、これらのIPアドレスに対するアクセス許可を実施する必要があります。
IP Ranges (updated as of 2/20/2012)
| United States (South/Central) |
| 65.55.80.0/20 |
| 65.54.48.0/21 |
| 65.55.64.0/20 |
| 70.37.48.0/20 |
| 70.37.64.0/18 |
| 10.14.0.0/16 |
| 10.115.0.0/16 |
| 10.13.0.0/17 |
| 10.13.128.0/18 |
| 10.13.192.0/19 |
| 65.52.32.0/21 |
| 70.37.160.0/21 |
| 157.55.176.0/20 |
| 157.55.103.48/28 |
| 10.186.64.0/18 |
| 157.55.192.0/22 |
| 157.55.103.32/28 |
| 10.186.160.0/19 |
| 157.55.196.0/22 |
| 157.55.200.0/22 |
| 157.55.153.224/28 |
| 157.55.80.0/22 |
| 157.55.84.0/22 |
| 10.174.192.0/18 |
| United States (North/Central) |
| 207.46.192.0/20 |
| 65.52.0.0/19 |
| 65.52.192.0/19 |
| 65.52.48.0/20 |
| 209.240.220.0/23 |
| 65.52.106.240/28 |
| 65.52.106.16/28 |
| 65.52.107.0/28 |
| 65.52.106.224/28 |
| 65.52.106.32/27 |
| 65.52.106.64/27 |
| 65.52.106.160/27 |
| 65.52.106.192/27 |
| 65.52.106.96/27 |
| 65.52.106.128/27 |
| 157.55.136.0/21 |
| 10.26.0.0/17 |
| 10.28.0.0/17 |
| 10.28.128.0/17 |
| 10.29.0.0/19 |
| 157.55.160.0/20 |
| 157.55.60.224/28 |
| 10.186.0.0/18 |
| 157.55.24.0/21 |
| 157.55.208.0/21 |
| 157.55.60.240/28 |
| 10.186.128.0/19 |
| 157.55.151.0/28 |
| 157.55.216.0/22 |
| 157.55.220.0/22 |
| 157.55.73.32/28 |
| 157.56.8.0/22 |
| 157.56.12.0/22 |
| 157.56.24.160/28 |
| 65.52.232.0/22 |
| 65.52.236.0/22 |
| 157.56.24.176/28 |
| 65.52.240.0/22 |
| 65.52.244.0/22 |
| 157.56.24.192/28 |
| 157.56.28.0/22 |
| 157.55.252.0/22 |
| 10.174.128.0/18 |
| 10.174.112.0/20 |
| 10.114.128.0/17 |
| United States (North/West) |
| 10.7.0.0/17 |
| 10.7.128.0/18 |
| 10.7.192.0/19 |
| 10.8.0.0/17 |
| 10.114.67.160/27 |
| 10.114.90.192/27 |
| 10.114.70.0/23 |
| 10.11.108.0/22 |
| 10.11.112.0/21 |
| 10.11.120.0/23 |
| 10.114.82.0/23 |
| 10.114.84.0/22 |
| 65.55.25.112/28 |
| 65.52.98.96/28 |
| 65.52.103.128/27 |
| 65.52.103.160/27 |
| 65.52.98.96/28 |
| 65.55.19.64/26 |
| 65.52.99.0/24 |
| 65.52.101.0/24 |
| 65.55.25.96/28 |
| 65.55.32.0/20 |
| 70.37.0.0/19 |
| 70.37.32.0/20 |
| 209.240.212.0/23 |
| 209.240.214.0/23 |
| 209.240.218.0/23 |
| 209.240.222.0/23 |
| 10.21.192.0/18 |
| 10.12.0.0/18 |
| 10.12.128.0/17 |
| 10.113.0.0/16 |
| Europe (North) |
| 10.18.0.0/16 |
| 213.199.160.0/20 |
| 213.199.184.0/21 |
| 10.17.0.0/17 |
| 94.245.112.0/20 |
| 94.245.88.0/21 |
| 94.245.104.0/21 |
| 65.52.64.0/20 |
| 65.52.224.0/22 |
| 65.52.228.0/22 |
| 65.52.248.0/21 |
| 10.3.0.0/17 |
| 10.211.0.0/17 |
| 10.211.128.0/17 |
| 10.26.128.0/17 |
| 157.55.3.0/24 |
| 10.119.192.0/18 |
| 168.63.32.0/19 |
| Europe (West) |
| 157.55.9.112/28 |
| 157.55.12.0/28 |
| 157.55.10.0/27 |
| 157.55.10.32/27 |
| 157.55.10.64/26 |
| 10.53.144.0/20 |
| 10.53.128.0/23 |
| 94.245.97.0/24 |
| 10.9.223.0/24 |
| 10.112.192.0/23 |
| 65.52.128.0/19 |
| 10.61.0.0/16 |
| 213.199.128.0/21 |
| 213.199.180.112/28 |
| 213.199.180.32/28 |
| 213.199.180.96/28 |
| 213.199.180.192/26 |
| 213.199.183.0/24 |
| 157.55.8.128/28 |
| 157.55.8.144/28 |
| 157.55.8.160/28 |
| 157.55.8.64/26 |
| 10.119.128.0/18 |
| 168.63.0.0/19 |
| Asia (Southeast) |
| 207.46.48.0/20 |
| 111.221.16.0/21 |
| 111.221.80.0/20 |
| 111.221.96.0/20 |
| 10.210.128.0/17 |
| 10.210.20.0/22 |
| 10.25.192.0/18 |
| 10.15.0.0/16 |
| 10.146.192.0/18 |
| 168.63.160.0/19 |
| Asia (East) |
| 10.9.252.0/24 |
| 111.221.64.0/22 |
| 207.46.72.0/26 |
| 207.46.89.16/28 |
| 207.46.95.32/27 |
| 207.46.77.224/28 |
| 10.23.184.0/22 |
| 10.25.32.0/21 |
| 65.52.160.0/19 |
| 10.62.0.0/16 |
| 207.46.87.0/24 |
| 207.46.67.160/27 |
| 207.46.67.192/27 |
| 10.146.128.0/18 |
| 168.63.128.0/19 |
