first IP address in a subnet identify the subnet itself (192.168.1.0).127.0.0.1 is used by devices to identify itself.Let’s consider a classical home network where 192.168.1.x (last digit being variable and lower than 255) are IP addresses and netmask 255.255.255.0 Some IP address have special functions and their use is forbidden for devices networking interfaces. For example with a netmask 255.255.255.0 (also known as “/24”) all devices which has same first 3 numbers are on same sub-network. Netmasks are used to separate logically networks and optimize traffic routing. This way, every request sent to a specific IP can reach only one device.īeside IP address, a netmask is a similar label: still 32-bit value, its readable forma has 4 numbers divided by dots. An example is “2001:db8:0:1234:0:567:8:1”īefore going ahead, in this article we’ll refer only to IPv4 addresses, because IPv6 usage is really rare.Įach device connected to a computer network needs to have a single and unique IP address. In this case IP address is represented with 8 exadecimal numbers separated by dots. IP version 6 (IPv6) – going to be the (far) future.In this case IP address is represented with 4 numbers (each one being between 0 and 255) separated by dots. IP version 4 (IPv4) – most spread and used.Arrowheads - Currency system for the Ironsworn tab.Follow peppe8o posts on -> Twitter What is an IP addressĪn Internet Protocol address (IP address) is label composed by chars/numbers separated by dots.Scans your LAN and appends the open ports found to mylan.txt. Again, the "rdns" can go anywhere in the arguments. Scans a range and also shows the reverse DNS of any finds. It will still never finish but it's 3 times faster than doing it alone. Three commands, to be run on three separate computers, that cooperatively scan the whole IPv4 internet for any open ports using 3900 sockets each in parallel. The sockets and timeout parameters can go anywhere in the arguments.
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