ip address and subnet mask tutorial

different local area networks, of course, it also has another function, that is to distinguish the same LAN in different host (PRO, a LAN can have a lot of hosts Ah, of course, to distinguish). 2.IP Address(1) IP address and dotted decimal notationThe computer can know everything else is a binary number, so the

PHP Get visitors Real IP address in my time we need to get the user's real IP address, for example, log records, geo-location, user information, website data analysis, in fact, get the IP address is very simple $_server[' remote_a

In-depth analysis of several PHP client IP addresses. In this article, we will introduce in detail how to use $ _ SERVER [REMOTE_ADDR] to obtain the client IP address in PHP. However, if the client uses a proxy server for access, we will provide a detailed description of the obtained information in this article. $ _ SERVER ["REMOTE_ADDR"] is often used to obtain

You can download the IP Location Extension class library at the http://www.thinkphp.cn/extend/223.html of the official website, or the extension class is already included in the download extension package (http://www.thinkphp.cn/down/253.html). If the Upload class library is downloaded separately, put the extracted IpLocation.class.php into the thinkphp/extend/library/org/net/(if not manually created) directory below. First, get the

Yesterday to determine the user IP source, and then enter the user IP address of the network segment, we first need to IP address and integer conversion function implementation, let me see System Functions Ip2long and Long2ip PHP has built-in functions ip2long can convert

The security method HTTP_X_FORWARDED_FOR for obtaining user IP addresses on the web site. The code for copying the getIP function after security filtering is as follows: functiongetIP () {$ realip; set the default value if (isset ($ _ SERVER [HTTP_X_FORWARDED_FOR]) {$ realip $ _ SERVER [getIP function after HTTP _ security filter The code is as follows: Function getIP (){$ Realip = ''; // set the default valueIf (isset ($ _ SERVER ['http _ X_FORWAR

Php is a good way to obtain the user IP address. REMOTE_ADDR can only obtain the IP address set in the visitor's local connection, for example, 10 configured on a college campus network. x. XXX. XXX Series IP address, and this fun

The regular expression of the IP address. The following are two instances of the ip address regular expression. the instance verifies multiple IP addresses and prints out valid ip addresses. The following is an example of two regu

The article first introduces the structure of the file content of Qqwry.dat and then according to its characteristics we can write read the contents of the Qqwry.dat IP library to find what we want. First look at the content structure of the Qqwry.data file and how to interpret it. I. Structure of the documentThe file consists of three structures1, file header, 8 bytes;2, data record area, indefinite length;3, the index area, the length is 7 integer t

Php implements how to obtain the province and city based on the IP address. Php implements how to obtain the province and city based on the IP address. today, this article discusses how to obtain the user IP address in PHP, how to

PHP Get visitor IP Address summary 　PHP Get visitor IP Address summary In my time we need to get the user's real IP address, for example, log records, geo-location, user information, website data analysis, in fact, get the