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双ISP出口用到的ip地址表
Network Address Range: Class A
The designers of the IP address scheme said that the first bit of the first byte in a Class A network address must always be off, or 0. This means a Class A address must be between 0 and 127 in the first byte, inclusive.
Consider the following network address:
0xxxxxxx
If we turn the other 7 bits all off and then turn them all on, we’ll find the Class A range of network addresses:
00000000 = 0
01111111 = 127
So, a Class A network is defined in the first octet between 0 and 127, and it can’t be less or more. (Yes, I know 0 and 127 are not valid in a Class A network. I’ll talk about reserved addresses in a minute.)
Network Address Range: Class B
In a Class B network, the RFCs state that the first bit of the first byte must always be turned on but the second bit must always be turned off. If you turn the other 6 bits all off and then
all on, you will find the range for a Class B network:
10000000 = 128
10111111 = 191
As you can see, a Class B network is defined when the first byte is configured from 128 to 191.
Network Address Range: Class C
For Class C networks, the RFCs define the first 2 bits of the first octet as always turned on, but the third bit can never be on. Following the same process as the previous classes, convert from binary to decimal to find the range. Here’s the range for a Class C network:
11000000 = 192
11011111 = 223
So, if you see an IP address that starts at 192 and goes to 223, you’ll know it is a Class C IP address.
Network Address Ranges: Classes D and E
The addresses between 224 to 255 are reserved for Class D and E networks. Class D (224–239) is used for multicast addresses and Class E (240–255) for scientific purposes, but I’m not going into these types of addresses in this book (and you don’t need to know them).
Remember the Class A range. The IP range for a Class A network is 1–126. This provides 8 bits of network addressing and 24 bits of host addressing by default.
Remember the Class B range. The IP range for a Class B network is 128–191. Class B
addressing provides 16 bits of network addressing and 16 bits of host addressing by default.
Remember the Class C range. The IP range for a Class C network is 192–223. Class C
addressing provides 24 bits of network addressing and 8 bits of host addressing by default.
Remember the Private IP ranges.
Class A private address range is 10.0.0.0 through 10.255.255.255.
Class B private address range is 172.16.0.0 through 172.31.255.255.
Class C private address range is 192.168.0.0 through 192.168.255.255.
The designers of the IP address scheme said that the first bit of the first byte in a Class A network address must always be off, or 0. This means a Class A address must be between 0 and 127 in the first byte, inclusive.
Consider the following network address:
0xxxxxxx
If we turn the other 7 bits all off and then turn them all on, we’ll find the Class A range of network addresses:
00000000 = 0
01111111 = 127
So, a Class A network is defined in the first octet between 0 and 127, and it can’t be less or more. (Yes, I know 0 and 127 are not valid in a Class A network. I’ll talk about reserved addresses in a minute.)
Network Address Range: Class B
In a Class B network, the RFCs state that the first bit of the first byte must always be turned on but the second bit must always be turned off. If you turn the other 6 bits all off and then
all on, you will find the range for a Class B network:
10000000 = 128
10111111 = 191
As you can see, a Class B network is defined when the first byte is configured from 128 to 191.
Network Address Range: Class C
For Class C networks, the RFCs define the first 2 bits of the first octet as always turned on, but the third bit can never be on. Following the same process as the previous classes, convert from binary to decimal to find the range. Here’s the range for a Class C network:
11000000 = 192
11011111 = 223
So, if you see an IP address that starts at 192 and goes to 223, you’ll know it is a Class C IP address.
Network Address Ranges: Classes D and E
The addresses between 224 to 255 are reserved for Class D and E networks. Class D (224–239) is used for multicast addresses and Class E (240–255) for scientific purposes, but I’m not going into these types of addresses in this book (and you don’t need to know them).
Remember the Class A range. The IP range for a Class A network is 1–126. This provides 8 bits of network addressing and 24 bits of host addressing by default.
Remember the Class B range. The IP range for a Class B network is 128–191. Class B
addressing provides 16 bits of network addressing and 16 bits of host addressing by default.
Remember the Class C range. The IP range for a Class C network is 192–223. Class C
addressing provides 24 bits of network addressing and 8 bits of host addressing by default.
Remember the Private IP ranges.
Class A private address range is 10.0.0.0 through 10.255.255.255.
Class B private address range is 172.16.0.0 through 172.31.255.255.
Class C private address range is 192.168.0.0 through 192.168.255.255.
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ospf重分发默认路由无法进入路由表问题
2020-11-12 17:30 1079机房内设备升级改造,核心交换机与3台互联网路由器对接,中间 ... -
ASA5520 remote ipsec vpn配置
2013-08-29 13:14 5083接口启用ISAKMP: crypto isakmp enabl ... -
javascript 自动填写用户已输入的用户名及密码
2013-01-17 15:22 4591<!DOCTYPE html PUBLIC " ... -
H3C Spanning Tree
2012-12-21 10:07 1718stp mode stp stp instance 1 ... -
关于ASA5520的radius认证remote vpn用户配置延时
2012-08-17 13:53 2441近日对ciscovpn认证服务器进行迁移发现ASA5520配置 ... -
windows2008R2 NPS导致dhcp无法分派地址
2012-08-16 16:36 3343近几天正在考虑将nps在windows2008r2系统(已部署 ... -
双ISP出口用到的ip地址表
2012-08-14 16:59 1336中国电信ip段 http://bgp.he.net/AS413 ... -
ciscoRV042对接cisco2951,日志
2012-08-07 13:12 2738在2951上的ike策略10无法与RV042的策略匹配,需要手 ... -
静态路由重分发进入ospf的深入学习
2012-05-03 11:29 4987路由器与三层交换机已形成ospf邻居关系, 现在要将与此台 ... -
H3C MSR50-40 路由器,关闭web管理
2012-01-09 16:56 1318[MSR50-40] undo ip http enable ... -
路由器接口参数及意义
2011-12-21 20:33 1485router#sh int fa0/0 FastEtherne ... -
cisco设备telnet显示console日志信息
2011-12-20 21:55 1352全局模式下输入命令:terminal monitor -
FTP 被动、主动模式解析
2011-12-10 19:52 797Technical background What dis ... -
关于MSTP线路的Qos拥塞控制问题!
2011-10-08 23:05 1593mstp线路为用户接入提供超过2Mbps的接入速度,为sdh提 ... -
cisco路由器密码重置
2011-09-21 11:40 1146when the router is starting to ... -
windows2003中文版,windows2008R2英文版,dhcp服务器迁移
2011-07-19 16:20 17901)windows2003 netsh dhcp se ... -
IIS页面访问问题
2011-07-07 20:45 1078(转) “您未被授权查看该页,您不具备使用所提供的凭 ... -
常用端口号
2011-06-27 21:58 1047List of TCP and UDP port number ... -
关于cisco 4507R的主控板卡冗余
2011-06-24 11:30 1947切换主处理板卡:redundancy force−switch ... -
ASA5200的NAT旁路访问DMZ区域!
2011-04-26 22:39 1941最近开始搞cisco ASA设备,发现在nat的acl中无法使 ...
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