IPIP 地址列表: 168.21.*.* (168.21.0.* - 168.21.255.*)
這是第壹個字節為168，第二個字節為21，第三個字節在0 - 255之間，第四字節可變動（下面為星號）的IP地址列表，表示為168.21.*.* (168.21.0.0 - 168.21.255.255)。
這個IP地址列表中包含256 * 256 = 65,536個IP地址，我們以其中壹個IP地址168.21.1.1為例，來描述這個IP的屬性：
但這只是其中1個IP地址的例子，並不代表這個列表中所有的IP地址都有同樣的屬性，如果需要了解其它IP和更詳細的IP地址段信息，請點擊下面列表中的標題鏈接。
二進制、十進制和十六進制的 IP 地址說明
IP 地址類別 A/B/C/D/E 和網絡 ID、主機 ID 的說明
內容:
2. B類IP地址列表
B類IP地址是指：在IP地址的四段號碼（例如：字節1.字節2.字節3.字節4）中，前兩段號碼（字節1.字節2）為網絡號碼，剩下的後兩段號碼（字節3.字節4）為本地計算機的號碼。 如果用二進制表示IP地址的話，B類IP地址就由2字節的網絡地址和2字節主機地址組成，網絡地址的最高位必須是'10'。 B類IP地址範圍：128.0.0.0 ~ 191.255.255.255，可用IP地址範圍：128.0.0.1 ~ 191.255.255.254。 B類IP地址中網絡的標識長度為14位，主機標識的長度為16位，B類網絡地址適用於中等規模規模的網絡（2 ^ 14 = 16384個），每個網絡所能容納6萬多臺計算機（2 ^ 16 - 2 = 65534個）。 如果您需要了解B類IP段更詳細的IP地址段信息，請點擊B類IP地址列表中的標題鏈接。
- 168.21.0.*(168.21.0.0 - 168.21.0.254)
- 168.21.1.*(168.21.1.0 - 168.21.1.254)
- 168.21.2.*(168.21.2.0 - 168.21.2.254)
- 168.21.3.*(168.21.3.0 - 168.21.3.254)
- 168.21.4.*(168.21.4.0 - 168.21.4.254)
- 168.21.5.*(168.21.5.0 - 168.21.5.254)
- 168.21.6.*(168.21.6.0 - 168.21.6.254)
- 168.21.7.*(168.21.7.0 - 168.21.7.254)
- 168.21.8.*(168.21.8.0 - 168.21.8.254)
- 168.21.9.*(168.21.9.0 - 168.21.9.254)
- 168.21.10.*(168.21.10.0 - 168.21.10.254)
- 168.21.11.*(168.21.11.0 - 168.21.11.254)
- 168.21.12.*(168.21.12.0 - 168.21.12.254)
- 168.21.13.*(168.21.13.0 - 168.21.13.254)
- 168.21.14.*(168.21.14.0 - 168.21.14.254)
- 168.21.15.*(168.21.15.0 - 168.21.15.254)
- 168.21.16.*(168.21.16.0 - 168.21.16.254)
- 168.21.17.*(168.21.17.0 - 168.21.17.254)
- 168.21.18.*(168.21.18.0 - 168.21.18.254)
- 168.21.19.*(168.21.19.0 - 168.21.19.254)
- 168.21.20.*(168.21.20.0 - 168.21.20.254)
- 168.21.21.*(168.21.21.0 - 168.21.21.254)
- 168.21.22.*(168.21.22.0 - 168.21.22.254)
- 168.21.23.*(168.21.23.0 - 168.21.23.254)
- 168.21.24.*(168.21.24.0 - 168.21.24.254)
- 168.21.25.*(168.21.25.0 - 168.21.25.254)
- 168.21.26.*(168.21.26.0 - 168.21.26.254)
- 168.21.27.*(168.21.27.0 - 168.21.27.254)
- 168.21.28.*(168.21.28.0 - 168.21.28.254)
- 168.21.29.*(168.21.29.0 - 168.21.29.254)
- 168.21.30.*(168.21.30.0 - 168.21.30.254)
- 168.21.31.*(168.21.31.0 - 168.21.31.254)
- 168.21.32.*(168.21.32.0 - 168.21.32.254)
- 168.21.33.*(168.21.33.0 - 168.21.33.254)
- 168.21.34.*(168.21.34.0 - 168.21.34.254)
- 168.21.35.*(168.21.35.0 - 168.21.35.254)
- 168.21.36.*(168.21.36.0 - 168.21.36.254)
- 168.21.37.*(168.21.37.0 - 168.21.37.254)
- 168.21.38.*(168.21.38.0 - 168.21.38.254)
- 168.21.39.*(168.21.39.0 - 168.21.39.254)
- 168.21.40.*(168.21.40.0 - 168.21.40.254)
- 168.21.41.*(168.21.41.0 - 168.21.41.254)
- 168.21.42.*(168.21.42.0 - 168.21.42.254)
- 168.21.43.*(168.21.43.0 - 168.21.43.254)
- 168.21.44.*(168.21.44.0 - 168.21.44.254)
- 168.21.45.*(168.21.45.0 - 168.21.45.254)
- 168.21.46.*(168.21.46.0 - 168.21.46.254)
- 168.21.47.*(168.21.47.0 - 168.21.47.254)
- 168.21.48.*(168.21.48.0 - 168.21.48.254)
- 168.21.49.*(168.21.49.0 - 168.21.49.254)
- 168.21.50.*(168.21.50.0 - 168.21.50.254)
- 168.21.51.*(168.21.51.0 - 168.21.51.254)
- 168.21.52.*(168.21.52.0 - 168.21.52.254)
- 168.21.53.*(168.21.53.0 - 168.21.53.254)
- 168.21.54.*(168.21.54.0 - 168.21.54.254)
- 168.21.55.*(168.21.55.0 - 168.21.55.254)
- 168.21.56.*(168.21.56.0 - 168.21.56.254)
- 168.21.57.*(168.21.57.0 - 168.21.57.254)
- 168.21.58.*(168.21.58.0 - 168.21.58.254)
- 168.21.59.*(168.21.59.0 - 168.21.59.254)
- 168.21.60.*(168.21.60.0 - 168.21.60.254)
- 168.21.61.*(168.21.61.0 - 168.21.61.254)
- 168.21.62.*(168.21.62.0 - 168.21.62.254)
- 168.21.63.*(168.21.63.0 - 168.21.63.254)
- 168.21.64.*(168.21.64.0 - 168.21.64.254)
- 168.21.65.*(168.21.65.0 - 168.21.65.254)
- 168.21.66.*(168.21.66.0 - 168.21.66.254)
- 168.21.67.*(168.21.67.0 - 168.21.67.254)
- 168.21.68.*(168.21.68.0 - 168.21.68.254)
- 168.21.69.*(168.21.69.0 - 168.21.69.254)
- 168.21.70.*(168.21.70.0 - 168.21.70.254)
- 168.21.71.*(168.21.71.0 - 168.21.71.254)
- 168.21.72.*(168.21.72.0 - 168.21.72.254)
- 168.21.73.*(168.21.73.0 - 168.21.73.254)
- 168.21.74.*(168.21.74.0 - 168.21.74.254)
- 168.21.75.*(168.21.75.0 - 168.21.75.254)
- 168.21.76.*(168.21.76.0 - 168.21.76.254)
- 168.21.77.*(168.21.77.0 - 168.21.77.254)
- 168.21.78.*(168.21.78.0 - 168.21.78.254)
- 168.21.79.*(168.21.79.0 - 168.21.79.254)
- 168.21.80.*(168.21.80.0 - 168.21.80.254)
- 168.21.81.*(168.21.81.0 - 168.21.81.254)
- 168.21.82.*(168.21.82.0 - 168.21.82.254)
- 168.21.83.*(168.21.83.0 - 168.21.83.254)
- 168.21.84.*(168.21.84.0 - 168.21.84.254)
- 168.21.85.*(168.21.85.0 - 168.21.85.254)
- 168.21.86.*(168.21.86.0 - 168.21.86.254)
- 168.21.87.*(168.21.87.0 - 168.21.87.254)
- 168.21.88.*(168.21.88.0 - 168.21.88.254)
- 168.21.89.*(168.21.89.0 - 168.21.89.254)
- 168.21.90.*(168.21.90.0 - 168.21.90.254)
- 168.21.91.*(168.21.91.0 - 168.21.91.254)
- 168.21.92.*(168.21.92.0 - 168.21.92.254)
- 168.21.93.*(168.21.93.0 - 168.21.93.254)
- 168.21.94.*(168.21.94.0 - 168.21.94.254)
- 168.21.95.*(168.21.95.0 - 168.21.95.254)
- 168.21.96.*(168.21.96.0 - 168.21.96.254)
- 168.21.97.*(168.21.97.0 - 168.21.97.254)
- 168.21.98.*(168.21.98.0 - 168.21.98.254)
- 168.21.99.*(168.21.99.0 - 168.21.99.254)
- 168.21.100.*(168.21.100.0 - 168.21.100.254)
- 168.21.101.*(168.21.101.0 - 168.21.101.254)
- 168.21.102.*(168.21.102.0 - 168.21.102.254)
- 168.21.103.*(168.21.103.0 - 168.21.103.254)
- 168.21.104.*(168.21.104.0 - 168.21.104.254)
- 168.21.105.*(168.21.105.0 - 168.21.105.254)
- 168.21.106.*(168.21.106.0 - 168.21.106.254)
- 168.21.107.*(168.21.107.0 - 168.21.107.254)
- 168.21.108.*(168.21.108.0 - 168.21.108.254)
- 168.21.109.*(168.21.109.0 - 168.21.109.254)
- 168.21.110.*(168.21.110.0 - 168.21.110.254)
- 168.21.111.*(168.21.111.0 - 168.21.111.254)
- 168.21.112.*(168.21.112.0 - 168.21.112.254)
- 168.21.113.*(168.21.113.0 - 168.21.113.254)
- 168.21.114.*(168.21.114.0 - 168.21.114.254)
- 168.21.115.*(168.21.115.0 - 168.21.115.254)
- 168.21.116.*(168.21.116.0 - 168.21.116.254)
- 168.21.117.*(168.21.117.0 - 168.21.117.254)
- 168.21.118.*(168.21.118.0 - 168.21.118.254)
- 168.21.119.*(168.21.119.0 - 168.21.119.254)
- 168.21.120.*(168.21.120.0 - 168.21.120.254)
- 168.21.121.*(168.21.121.0 - 168.21.121.254)
- 168.21.122.*(168.21.122.0 - 168.21.122.254)
- 168.21.123.*(168.21.123.0 - 168.21.123.254)
- 168.21.124.*(168.21.124.0 - 168.21.124.254)
- 168.21.125.*(168.21.125.0 - 168.21.125.254)
- 168.21.126.*(168.21.126.0 - 168.21.126.254)
- 168.21.127.*(168.21.127.0 - 168.21.127.254)
- 168.21.128.*(168.21.128.0 - 168.21.128.254)
- 168.21.129.*(168.21.129.0 - 168.21.129.254)
- 168.21.130.*(168.21.130.0 - 168.21.130.254)
- 168.21.131.*(168.21.131.0 - 168.21.131.254)
- 168.21.132.*(168.21.132.0 - 168.21.132.254)
- 168.21.133.*(168.21.133.0 - 168.21.133.254)
- 168.21.134.*(168.21.134.0 - 168.21.134.254)
- 168.21.135.*(168.21.135.0 - 168.21.135.254)
- 168.21.136.*(168.21.136.0 - 168.21.136.254)
- 168.21.137.*(168.21.137.0 - 168.21.137.254)
- 168.21.138.*(168.21.138.0 - 168.21.138.254)
- 168.21.139.*(168.21.139.0 - 168.21.139.254)
- 168.21.140.*(168.21.140.0 - 168.21.140.254)
- 168.21.141.*(168.21.141.0 - 168.21.141.254)
- 168.21.142.*(168.21.142.0 - 168.21.142.254)
- 168.21.143.*(168.21.143.0 - 168.21.143.254)
- 168.21.144.*(168.21.144.0 - 168.21.144.254)
- 168.21.145.*(168.21.145.0 - 168.21.145.254)
- 168.21.146.*(168.21.146.0 - 168.21.146.254)
- 168.21.147.*(168.21.147.0 - 168.21.147.254)
- 168.21.148.*(168.21.148.0 - 168.21.148.254)
- 168.21.149.*(168.21.149.0 - 168.21.149.254)
- 168.21.150.*(168.21.150.0 - 168.21.150.254)
- 168.21.151.*(168.21.151.0 - 168.21.151.254)
- 168.21.152.*(168.21.152.0 - 168.21.152.254)
- 168.21.153.*(168.21.153.0 - 168.21.153.254)
- 168.21.154.*(168.21.154.0 - 168.21.154.254)
- 168.21.155.*(168.21.155.0 - 168.21.155.254)
- 168.21.156.*(168.21.156.0 - 168.21.156.254)
- 168.21.157.*(168.21.157.0 - 168.21.157.254)
- 168.21.158.*(168.21.158.0 - 168.21.158.254)
- 168.21.159.*(168.21.159.0 - 168.21.159.254)
- 168.21.160.*(168.21.160.0 - 168.21.160.254)
- 168.21.161.*(168.21.161.0 - 168.21.161.254)
- 168.21.162.*(168.21.162.0 - 168.21.162.254)
- 168.21.163.*(168.21.163.0 - 168.21.163.254)
- 168.21.164.*(168.21.164.0 - 168.21.164.254)
- 168.21.165.*(168.21.165.0 - 168.21.165.254)
- 168.21.166.*(168.21.166.0 - 168.21.166.254)
- 168.21.167.*(168.21.167.0 - 168.21.167.254)
- 168.21.168.*(168.21.168.0 - 168.21.168.254)
- 168.21.169.*(168.21.169.0 - 168.21.169.254)
- 168.21.170.*(168.21.170.0 - 168.21.170.254)
- 168.21.171.*(168.21.171.0 - 168.21.171.254)
- 168.21.172.*(168.21.172.0 - 168.21.172.254)
- 168.21.173.*(168.21.173.0 - 168.21.173.254)
- 168.21.174.*(168.21.174.0 - 168.21.174.254)
- 168.21.175.*(168.21.175.0 - 168.21.175.254)
- 168.21.176.*(168.21.176.0 - 168.21.176.254)
- 168.21.177.*(168.21.177.0 - 168.21.177.254)
- 168.21.178.*(168.21.178.0 - 168.21.178.254)
- 168.21.179.*(168.21.179.0 - 168.21.179.254)
- 168.21.180.*(168.21.180.0 - 168.21.180.254)
- 168.21.181.*(168.21.181.0 - 168.21.181.254)
- 168.21.182.*(168.21.182.0 - 168.21.182.254)
- 168.21.183.*(168.21.183.0 - 168.21.183.254)
- 168.21.184.*(168.21.184.0 - 168.21.184.254)
- 168.21.185.*(168.21.185.0 - 168.21.185.254)
- 168.21.186.*(168.21.186.0 - 168.21.186.254)
- 168.21.187.*(168.21.187.0 - 168.21.187.254)
- 168.21.188.*(168.21.188.0 - 168.21.188.254)
- 168.21.189.*(168.21.189.0 - 168.21.189.254)
- 168.21.190.*(168.21.190.0 - 168.21.190.254)
- 168.21.191.*(168.21.191.0 - 168.21.191.254)
- 168.21.192.*(168.21.192.0 - 168.21.192.254)
- 168.21.193.*(168.21.193.0 - 168.21.193.254)
- 168.21.194.*(168.21.194.0 - 168.21.194.254)
- 168.21.195.*(168.21.195.0 - 168.21.195.254)
- 168.21.196.*(168.21.196.0 - 168.21.196.254)
- 168.21.197.*(168.21.197.0 - 168.21.197.254)
- 168.21.198.*(168.21.198.0 - 168.21.198.254)
- 168.21.199.*(168.21.199.0 - 168.21.199.254)
- 168.21.200.*(168.21.200.0 - 168.21.200.254)
- 168.21.201.*(168.21.201.0 - 168.21.201.254)
- 168.21.202.*(168.21.202.0 - 168.21.202.254)
- 168.21.203.*(168.21.203.0 - 168.21.203.254)
- 168.21.204.*(168.21.204.0 - 168.21.204.254)
- 168.21.205.*(168.21.205.0 - 168.21.205.254)
- 168.21.206.*(168.21.206.0 - 168.21.206.254)
- 168.21.207.*(168.21.207.0 - 168.21.207.254)
- 168.21.208.*(168.21.208.0 - 168.21.208.254)
- 168.21.209.*(168.21.209.0 - 168.21.209.254)
- 168.21.210.*(168.21.210.0 - 168.21.210.254)
- 168.21.211.*(168.21.211.0 - 168.21.211.254)
- 168.21.212.*(168.21.212.0 - 168.21.212.254)
- 168.21.213.*(168.21.213.0 - 168.21.213.254)
- 168.21.214.*(168.21.214.0 - 168.21.214.254)
- 168.21.215.*(168.21.215.0 - 168.21.215.254)
- 168.21.216.*(168.21.216.0 - 168.21.216.254)
- 168.21.217.*(168.21.217.0 - 168.21.217.254)
- 168.21.218.*(168.21.218.0 - 168.21.218.254)
- 168.21.219.*(168.21.219.0 - 168.21.219.254)
- 168.21.220.*(168.21.220.0 - 168.21.220.254)
- 168.21.221.*(168.21.221.0 - 168.21.221.254)
- 168.21.222.*(168.21.222.0 - 168.21.222.254)
- 168.21.223.*(168.21.223.0 - 168.21.223.254)
- 168.21.224.*(168.21.224.0 - 168.21.224.254)
- 168.21.225.*(168.21.225.0 - 168.21.225.254)
- 168.21.226.*(168.21.226.0 - 168.21.226.254)
- 168.21.227.*(168.21.227.0 - 168.21.227.254)
- 168.21.228.*(168.21.228.0 - 168.21.228.254)
- 168.21.229.*(168.21.229.0 - 168.21.229.254)
- 168.21.230.*(168.21.230.0 - 168.21.230.254)
- 168.21.231.*(168.21.231.0 - 168.21.231.254)
- 168.21.232.*(168.21.232.0 - 168.21.232.254)
- 168.21.233.*(168.21.233.0 - 168.21.233.254)
- 168.21.234.*(168.21.234.0 - 168.21.234.254)
- 168.21.235.*(168.21.235.0 - 168.21.235.254)
- 168.21.236.*(168.21.236.0 - 168.21.236.254)
- 168.21.237.*(168.21.237.0 - 168.21.237.254)
- 168.21.238.*(168.21.238.0 - 168.21.238.254)
- 168.21.239.*(168.21.239.0 - 168.21.239.254)
- 168.21.240.*(168.21.240.0 - 168.21.240.254)
- 168.21.241.*(168.21.241.0 - 168.21.241.254)
- 168.21.242.*(168.21.242.0 - 168.21.242.254)
- 168.21.243.*(168.21.243.0 - 168.21.243.254)
- 168.21.244.*(168.21.244.0 - 168.21.244.254)
- 168.21.245.*(168.21.245.0 - 168.21.245.254)
- 168.21.246.*(168.21.246.0 - 168.21.246.254)
- 168.21.247.*(168.21.247.0 - 168.21.247.254)
- 168.21.248.*(168.21.248.0 - 168.21.248.254)
- 168.21.249.*(168.21.249.0 - 168.21.249.254)
- 168.21.250.*(168.21.250.0 - 168.21.250.254)
- 168.21.251.*(168.21.251.0 - 168.21.251.254)
- 168.21.252.*(168.21.252.0 - 168.21.252.254)
- 168.21.253.*(168.21.253.0 - 168.21.253.254)
- 168.21.254.*(168.21.254.0 - 168.21.254.254)
- 168.21.255.*(168.21.255.0 - 168.21.255.254)
