how to calculate subnet mask from ip address with example

In this paper, a complete example of the implementation of C + + to obtain IP, subnet mask, gateway, DNS and other local network parameters of the method for your reference, the specific complete example is as follows: #pragma comment (lib, "Ws2_32.lib") #include

$ip= ' 192.168.6.1 ';$mask= ' 255.255.2.0 ';$sub _net=Array();//Sub-Network$ip _explode=Explode(‘.‘,$ip);$mask _explode=Explode(‘.‘,$mask);foreach($ip _explode as $key=$

the need to request a purchase.Subnet Mask:The subnet mask is not an address, it is used to determine which part of an IP address is the network ID, which part is the host ID, the portion of a continuous 1 represents the network ID, and a continuous portion of 0 represents

)); System.out.println (Inttoip (Dhcpinfo.gateway)); System.out.println (Inttoip (dhcpinfo.serveraddress)); System.out.println (Inttoip (dhcpinfo.dns1)); System.out.println (Inttoip (DHCPINFO.DNS2)); System.out.println (dhcpinfo.leaseduration); Sb.append ("WiFi info:"); Sb.append ("\nipaddress:" + Inttoip ( Wifiinfo.getipaddress ())); Sb.append ("\nmacaddress:" + wifiinfo.getmacaddress ()); Tvresult.settext (sb.toString ());} Private String Inttoip (int paramint) {return (Paramint 0xFF) + "." +

E cannot be assigned directly to the computer. Third, network ID, host ID, and subnet mask The network ID is used to indicate which network the computer belongs to, and the computer with the same network ID does not need to be able to communicate directly through a router connection, and we make a network with the same network ID as a local network (network segment); Communication between computers with di

This article describes the JS authentication IP, subnet mask, Gateway and Mac methods. Share to everyone for your reference. Specifically as follows: ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26-27--28 29---30 31--32 33 34 35 36 37 38-39 40 41 42 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70

Angry IP subnet obtains the IP address of the device. This software is used to scan the IP addresses of hosts in a certain CIDR block. Through usage discovery, the principle is to quickly ping each ip

The example of this article describes the approach of PHP for IP address mask operation. Share to everyone for your reference, specific as follows: IP Resolution: function Ip_parse ($ip _str) { $mark _len =; if (Strpos

Search a day, unexpectedly did not find a suitable code to obtain the machine all the network card IP, mask and broadcast address, most of the socket is used, but the socket is usually returned to the intranet address, or the public network address, can not find all addresse

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: the database stores IP addresses and

Python obtains all Nic ip addresses, mask and broadcast address instance code, and pythonip This article mainly studies how to use Python to obtain the ip addresses, masks, and broadcast addresses of all NICs on the local machine, and shares the related instance code. The details are as follows. After searching for a d

I. Set IP addresses, masks, gateways, and DNS using commands 1. Set the IP address and subnet mask of the network adapter eth0: sudo ifconfig eth0 192.168.0.50 netmask 255.255.255.02. Set the gateway sudo route add default GW 192.168.0.13. Set DNS modification/etc/resolv.

#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 char *ip_address, char *

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 mask into a number corres

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]) |

is realized by self-invocation to the correct network bit . -b = (A.split ('/') [0]). Split ('.') -A = B[0] +'.'+ b[1] +'.'+ b[2] +'.'+ str (int (b[-1])-1) +'/'+ A.split ('/') [-1] - Ipip (a) in - defMain (): to #The IP address and mask you need to know to enter the keyboard when executing the file +Inputip = Raw_input ('Please input IPaddress (

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

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;