what is ip address and subnet mask

#include #include #include #include int if_a_string_is_a_valid_ipv4_address (const char *STR){struct IN_ADDR addr;int ret;volatile int local_errno;errno = 0;ret = Inet_pton (af_inet, str, ADDR);Local_errno = errno;if (Ret > 0);else if (Ret printf ("Eafnosupport:%s\n", Strerror (Local_errno));Elseprintf ("\"%s\ "is not a valid IPV4 address\n", str);return ret;}BOOL Issubnetmask_and_is_ipv4_address (const cha

If we want to quickly get an IP address segment has how many IP, quickly get IP address segment subnet mask, or quickly get a binary IP

The problem is as follows: the database stores IP addresses and IP address masks, which need to be converted into the CIDR format, and not only convert the mask into a number corresponding to the CIDR. The problem is as follows: t

In Oracle, IP addresses and masks are converted to the CIDR format due to the following problems: IP addresses and IP address masks are stored in the database and must be converted to the CIDR format, in addition, it is not only about converting the

Public StaticIPAddress getbroadcast (IPAddress IPAddress, IPAddress subnetmask) {varIP =ipaddress.getaddressbytes (); varSub =subnetmask.getaddressbytes (); //broadcast address = Subnet bitwise negation or IP address for(vari =0; I ) {Ip[i]= (byte) ((~sub[i]) |

The IP address recorded in the text database. if the IP address already exists, it will not be added. if the IP address does not exist, it will be recorded in the text data. there will be a total of debugging errors. Document 1:

Obtain the local IP address, mask, and gateway in Linux. 1. Obtain the local IP address and mask /******************************** ************************************* Functi

IPY module originally used to enter the correct network bit and mask, I use the mechanism of processing error to achieve the input of any IP address and mask can correctly output the results of small programs.1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 #@Date: 2017-09-04 21:57:154 #@Author: Enderzhou ([email protecte

Php checks whether the IP address is a domestic IP address or a foreign IP address.

In the Aliyun background of cloud shield monitoring---"threat---" attack, will find a large number of malicious attacks every day, there are a large number of GET requests, resulting in server resources waste useless consumption. Type of attack in the last 7 days Carefully look at the source of the attack information, found that more than 99% of the attack IP address, there are historical att

This article describes the C + + acquisition of the local Mac,ip,mask address method, shared for everyone to reference. The specific methods are as follows: Copy Code code as follows: #include "InitSock.h" #include #include #pragma comment (lib, "IPHLPAPI.lib") U_char G_uclocalmac[6]; DWORD G_dwgatewayip; DWORD G_dwlocalip; DWORD G_dwmask;

#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,

Reference content:Http://baike.baidu.com/link?url= 6rsx0yrjy8chn4b0kflmjkdl23xutqxo6aziaxbh2ealwcxuuxmy-2ijhhciqifa8q20vg6ew9ps4ef9qrchbq#2_6 TCP/IP TCP/IP is a shorthand for the transmission Control protocol/internet Protocol, which is the most basic protocol for the Internet, which

Topic:The address that belongs to the network 112.10.200.0/21 is () 112.10.206.0 112.10.217.0 112.10.224.0 112.10.198.0 Analytical Solutions:Summarize: First, understand what the back of that 21 means, 21 means that the first 21 bits of the IP represents the network

The following method is used to determine whether an IP address is included in an IP Range: Some static methods may reference custom classes with the same name space, For merging two adjacent IP segments, you can add the maximum o

The previous article published the original IP address as the website address. After linux was shut down, the lab re-assigned a website address, which can be accessed by modifying the IP address but cannot be modified? I can't acc

Before using the 3G router, make sure that the 3G Internet card is plugged into the computer and can be unplugged successfully. If the 3G card directly connected to the computer can not dial the success, please contact the 3G operator (may be 3G signal coverage or the existence of arrears of fees and other issues). If you are using a 3G Internet card that is not in a compatible list of routers

How to view their IP address, my Computer native IP is what? IP address in the network of two different, if you are online at home and do not use the router, then there

Implementation Method: capture IP addresses through regular expressions to display website data .... Friendly reminder: This method is not highly efficient. If it is used in the Web, you can use this method if it is rarely used. If it is commonly used, it