Few years ago, tools to find the address by entering phone number were very valuable. It was funny, or useful to get the address of people who talk with us on the phone.
Nowadays, the first way to talk with friends is internet, and the phone number is replaced with instant message ID, or IRC nickname.
It is very hard to find the address of someone only knowing his instant message ID or IRC nickname, but you can find it’s location if you know his IP address.
The IP address it’s not easy to get, but you can give it a try: When talking with someone on instant message, close all other programs, then go to Start, Run, and type “cmd”. In the windows that opens, type “netstat”. Trough this command, all open connections will be showed. If you closed all other programs, you can figure out easy which is the IP address you need.
Now you have the IP address, what to do next, use the tool at http://www.ipgp.net to get location. You can zoom in or out to get more details.
Also, with this tool you can find the location of someone who posted something on your blog, forum or website.
DHCP stands for Dynamic Host Configuration Protocol, it is used by network adapters to request an internet address from a server, which has a list of addresses avaible for assignemt. There are used a set of rules to determine which internet addrress should be assigned to each device. The main rule is the MAC address of the network adapter, which is unique.
DHCP provides to the computer Ip address, subnet mask, and IP addresses for DNS. When a computer is added to the network, the DHCP server should be configured to accept the new computer. DHCP can’t assign the same IP address to more computers in the network, if the rules are not set exactly the nwtwork will have serious problems. A dhcp server is the perfect option for wireless networks, you don’t know who will connect to the network, but you can register MAC address of network adapters from the computers you want to be conected to the network.
Setting a network can take a lot of time, if you have a great number of computers on it, and if you don’t have dhcp server, you should configure each computer from that network. With DHCP you will need only to configure the server, on the other computers you will need only to install drivers for network adapters ( if required ).
DHCP was first introduced by Microsoft in Windows NT version 3.5, in late 1994, now, more and more networks, especially internet service providers or networks with a large number of computers, use DHCP servers for dinamic alocation of IP addresses.
CIDR, short for Classless Inter-Domain Routing is a prefix-based format for IP addresses. We was used to see IP addresses like 4 numbers separated by periods and they are called IPv4 addresses, but the internet is prospering quickly, we can connect to the internet from our personal computers, from portable computers, from pda’s, and from mobile phones. Think what will happen when each mobile phone will have a permanent connection to the internet. How many mobile phones are in the world ? And that isn’t everything, in short time almost every device will have a connection to the internet. A CIDR IP address consist of a IPv4 address followed by a slash and a number from 0 to 32. This number is the prefix length, the number of shared initial bits. The IPv4 address is 32 bit long, so, if a CIDR address is followed by number 16, this means that the first 16 bits from the IP are shared, in other words, 256 class C, equivalent to 1 class B. A CIDR address with 24 in the end is equivalent to 1 class C, or 256 hosts. In this way the internet will never run out of IP addresses.