ip and subnet mask calculator

Terms 1, IP address: is a 32-bit binary decimal number representation such as: 192.168.1.1--11000000.10101000.00000001.00000001 2, Subnet mask: is a network bit full ' 1 ', host bit full ' 0 ' dotted decimal notation such as: 255.255.255.0--11111111.11111111.11111111.00000000 3, network address: In the IP address

/*** Function name: validatemask* Function: verify the validity of the subnet mask.* Function Author: 236f (fuwei236 # gmail.com)* Input parameter: maskstr: The subnet mask in dotted decimal format (for example, 255.255.255.192)* Main function:* Call the function: _ checkiput_fomartip (

One, the IP division of the standard classificationThis division of IP in the form of IP in accordance with the network number + host number, each type of IP network number in the first few different, the rest of you except special IP (for example, all 0 and all 1, loopback

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) { $mark _len =; if (Strpos ($ip _str, "/") > 0) { list ($

========================================================== ====================================== Process and obtain data========================================================== ======================================# Cat CNC | grep inetnum | awk-F: '{print $2}' | sed-r's /(*)(. *)/\ 2/'| tr-d ""> cnc_ipcalc# Cat Chinanet | grep inetnum | awk-F: '{print $2}' | sed-r's /(*)(. *)/\ 2/'| tr-d ""> chinaet_ipcalc# Cat CRTC | grep inetnum | awk-F: '{print $2}' | sed-r's /(*)(. *)/\ 2/'| tr-d ""> crt

wired_dev "eth0"# Define wireless_dev "ra0"# Define pppoe_dev "ppp0" Char Buf [1024] = {'\ 0 '}; Extern int get_ipaddr (const char * net_dev, char * ipaddr );Get_ipaddr (wired_dev, Buf );Printf ("get_ipaddr: % s \ n", Buf );Memset (BUF, '\ 0', sizeof (BUF ));Extern void get_mask (const char * net_dev, iti_char * mask );Get_mask (wired_dev, Buf );Printf ("get_mask: % s \ n", Buf );Memset (BUF, '\ 0', sizeof (BUF ));Extern void get_gateway (iti_char *

, char *ipaddr);Get_ipaddr (Wired_dev, buf);printf ("Get_ipaddr:%s \ n", buf);memset (buf, ' n ', sizeof (BUF));extern void Get_mask (const char *net_dev, Iti_char *mask);Get_mask (Wired_dev, buf);printf ("Get_mask:%s \ n", buf);memset (buf, ' n ', sizeof (BUF));extern void Get_gateway (Iti_char *gateway);Get_gateway (BUF);printf ("Get_gateway:%s \ n", buf);memset (buf, ' n ', sizeof (BUF));extern int Get_dns (char *dns1, char *dns2);Get_dns (BUF, buf

(output)): Mask = Pattern.search (Maskaddr.group ()) if Mask.group ()! = ' 0xff000000 ' and mask.group ()! = ' 255.0.0.0 ': Masklist.append (Mask.group ()) return masklist elif platform = "Windows": Ipconfig_Process = subprocess. Popen ("ipconfig", stdout=subprocess. PIPE) output = Ipconfig_process.stdout.read () Mask_pattern = Re.compile (r "Subnet mask