how to calculate subnet mask from ip address with example

. Also use MySQL's function Inet_aton (' 119.115.0.0 ') to derive an integer. In addition MySQL database field set four fields, starting IP, terminating IP, starting IP integer, terminating IP integer, How to calculate an IP

#include #include #include #include #include #include #include #include int setifaddr (char *ifname, Char *ipaddr, char *mask,char *gateway){int fd;int RC;struct ifreq IFR;struct sockaddr_in *sin;struct Rtentry RT; FD = socket (af_inet, SOCK_DGRAM, 0);if (FD {perror ("socket error"); return-1; }memset (ifr,0,sizeof (IFR));strcpy (ifr.ifr_name,ifname);sin = (struct sockaddr_in*) ifr.ifr_addr; sin->sin_family = af_inet; //ipaddrif (Inet_aton (ipaddr,

/*Create table 'db _ online '('IP' char (20) default NULL,'Time' char (20) not null default '','Name' char (200) not null default 'tourists') TYPE = MyISAM*/// Roughly calculate the online time. If the ip address is the same (Lan> external network), only one person is recorded. However, there are few chances.Session_st

/* Create Table 'db _ online '('IP' char (20) default null,'Time' char (20) not null default '','Name' char (200) not null default 'tourists') Type = MyISAM */ // Roughly calculate the online time. If the IP address is the same (Lan> external network), only one person is recorded. However, there are few chances.

BroadcastAddress (broadcast address) is an address used to send messages to all workstations in the network at the same time. In a network that uses the TCPIP protocol, the IP address of the host ID segment hostID of all 1 is the broadcast address, broadcast... broadcast

application OFFLINEOra... l1.inst application OFFLINEOra... l2.inst application OFFLINE[Root @ node1 bin] #2. Use oifcfg to modify Nic settings. oifconfig can be used to set and view Nic usage methods. ��: Perform operations on node1 and node2. If the modified CIDR block is the same, do not do this. However, if the other CIDR blocks are the same, perform the following operations:# View the current configuration [Root @ node1 bin] #./oifcfg getif-globalEth0 192.168.0.0 global publicEth1 10.10.10

switching Protocol: multicast protocol information transmitted by the MLS-RP notifies the MLS-RP MAC address of the MLS-SE used, route and access control list changes, and so on. The MLS-SE uses this information to program the custom ASIC. Convention SeeCisco technical reminder practices.Network Diagram The following example uses the Routing Switching Module (RSM) to display a

Example of IP address query using Web Service Instance 01 implements a simple Web Service Access This instance implements the IP address query interface service and returns the province, city, and region where the IP

In php, there are user-defined functions that can help you determine the IP address, and we also use regular functions to determine the IP address. Below I will summarize some methods to verify the IP address. In php, there are us

Filter function Filters The IP address method: The code is as follows Copy Code Echo Filter_var ("127.0.0.1", "Filter_validate_int"); return TRUE or False Example. Determine if it is a legitimate IP The code is as follows Copy Code if (Filter_var ($

A simple example of phpcurl spoofing ip address $ Ch = curl_init (); Curl_setopt ($ ch, CURLOPT_URL, "http: // localhost/index. php "); $ R = revert (1,255 ); Curl_setopt ($ ch, CURLOPT_HTTPHEADER, array ('x-FORWARDED-FOR: 8.8.8. '. $ r, 'client-IP: 125.8.8. '. $ r

This article describes how to use Python to determine the validity of IP addresses. For more information, see the following figure: II. python implementation code: The code is as follows: [Root @ yang python] # vi check_ip.py#! /Usr/bin/pythonImport OS, sysDef check_ip (ipaddr ):Import sysAddr = ipaddr. strip (). split ('.') # cut the IP address into a li

1. See the figure for usage and execution results:Ii. python implementation code:Copy codeThe Code is as follows: [root @ yang python] # vi check_ip.py#! /Usr/bin/pythonImport OS, sysDef check_ip (ipaddr ):Import sysAddr = ipaddr. strip (). split ('.') # Cut the IP address into a list# Print addrIf len (addr )! = 4: # The list after cutting must have four parametersPrint "check

This article mainly describes how to capture the IP address of a proxy server using multiple Python threads. despite the existence of GIL, Python cannot truly implement multi-thread parallel processing, A friend can refer to here to capture the http://www.proxy.com.ru site proxy server as an example, the code is as follows: #! /Usr/bin/env python # coding: utf-

You can query the geographical longitude and latitude coordinates of an IP address based on the IP address. For example, in the following example, the IP

PHP Curl Forged IP Address and header information code example This article mainly introduces the PHP curl forged IP Address and header information code example, this article gives the server-side and client implementation code,

Here is an example of a proxy server crawling the http://www.proxy.com.ru site, with the following code: #!/usr/bin/env python#coding:utf-8import urllib2import reimport threadingimport timeimport MySQLdbrawProxyList = [] Checkedproxylist = [] #抓取代理网站targets = []for i in Xrange (1,42): target = r "http://www.proxy.com.ru/list_%d.html"% i Targ Ets.append (target) #抓取代理服务器正则p = Re.compile (R ' "(\d+) (. +?) (\d+) (.+?) (.+?)") #获取代理的类class Proxyget (th

PHP Curl Forged IP Address and header information code example, Curlheader Although Curl is powerful, but can only forge $_server["Http_x_forwarded_for", for most IP address detection procedures, $_server["REMOTE_ADDR"] is difficult to forge: The first is the client.php cod

How can I determine the IP address location? For example, if a Shanghai user logs on to our website, the domain name automatically jumps to Shanghai, such as the question, one website has two domain names, the primary domain name and the Shanghai domain name, how can a user in Shanghai automatically jump to the domain name in Shanghai by checking whether the user

The simplest use of PHP calls The code is as follows Copy Code $ip = "218.192.3.42";$json = file_get_contents ("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=jsonip=". $ip);$json = Json_decode ($json, true);echo "IP address:". $ip;ech