netmask

Our Datacenter has given us a JSON dump from all of our machines to import into our own inventory management system. This supplies the IP Blocks such as (192.168.1.1/26) but as I am importing hundreds of blocks, I would like to also calculate the Netmask and Gateway. I looked over the networking functions on the PHP Doxygen but was not able to find any way to do this. How can I calculate Netmask/Gateway from an IP Block? You can calculate the ip and mask using something like this: $ip_with_mask = '192.168.1.1/26'; list($ip, $mask_int) = explode('/', $ip_with_mask); $mask_nr = (pow(2, $mask_int

I need to write a bash script that when I enter two ip addresses, it will calculate summarize address for them. Examlpe: 192.168.1.27/25 192.168.1.129/25 Result will be: 192.168.1.0/24 Can you help me with this script? I know you will say to me “What did you try?” I tried to find something in Google, but what I found that I must to convert to binary then calculate it, and it will be very hard. I even don’t know how to start with it. Any idea or hint please? Calculation of common netmask with bash: #!/bin/bash D2B=({0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}) declare -i c=0 # set integer

I need to detect the local IP address and subnet mask on the WiFi network, on an Android device (in order to proper calculate the UDP broadcast address strictly for the local subnet). When the device is connected to an Access Point, the following is properly working: // Only works when NOT tethering WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); DhcpInfo dhcp = wifi.getDhcpInfo(); if (dhcp == null) throw new IOException("No DHCPInfo on WiFi side."); foo(dhcp.ipAddress, dhcp.netmask); But it doesn't work when it's the android device providing an Access Point

I'm trying to determine the network segment my Macbook is in, because I then want to scan this segment for active hosts (basic IP scanner) by using the CFHost class. Therefore I need the IP and Netmask of my active interface. This is how I get the IP: NSString *ipAddr = [[[NSHost currentHost] addresses] objectAtIndex:0]; But I have absolutely no idea how to get the Netmask, so I'm kind of stuck. Especially because I'm fairly new at Objective-C and because I also do not have extensive knowledge of plain C. I've looked at CFHost, CFNetwork, NSHost and various Google hits, but have found nothing