what is the purpose of a IP address and subnet mask???
115901
It's pretty much the foundation of the internet... it identifies your computer uniquely out of all the computers in the world. Think about it, let's say you wanted to you go yahoo.com (which you obviously did) you type it into your browser and hit enter, and your computer sends a message to yahoo.com saying basically "Hey, I want to look at your page" but without a unique identifier for your computer how does yahoo.com know *where* to send that page that was just requested? It can't just send the page to every computer in the world and hope it gets to you, it needs your ip address so that the page goes right to you.
496717
This is an IP that you want subnetting.\n\nWhy dont you use an online IP calc.  An example of one site is listed below.
82485
IP's are assigned to clients by a service known as DNS (Domain Name Service), your ISP has a DNS client that connects to the closest DNS on its route to query for a free (re-usable, of course!) IP. when it finds one, it assigns it to you, and registers that IP with the DNS (so it is not 're-assigned' while you are using it!).\nThere are only 7 DNS in the whole world, and they manage to keep up the traffic of the whole internet, pheew, think about that hardware, sweet God!!!\n\nMoreover, IP's refer to a 'domain name'. right, the numbers encrypt an actual name. like, www.yahoo.com = xxx.XXX.xx.XXX . Thus, if you want your computer to have always a same 'domain name', you need a "static IP", something you have to pay the DNS services a lot of money for...
282597
The first IP in the range is always the "name" of the network. So, All the rest are usable.\n\nThe usable range on the 200.10.10.64 network subnet would be 200.10.10.65 to 200.10.10.79\n\nAdded:\n\nRonin, I wondered about that, But I was thinking that only applied when the host section of the subnet was all binary 1's.  Maybe I was wrong.  I'll look it up again for my own information.
167559
do you mean domain name server???\n\nIt resolves IP addresses to alphanemeric names
50092
if one router is directly connected, it will be assigned an ip and it will make a subnet
1146163
You could do a reverse-DNS lookup.  I don't know how helpful the information would be from a security standpoint.  Also you would tax your web server's processor.
295743
If you convert an IP adress (and subnet mask) to binary, it makes more sense.   If a routing table has 2 options to send a request to:\n172.24.32.0/20 and \n172.24.32.0/24\nThe 2nd one is more specific< If you are looking to go an address, the router will pick the one that is the closest match.  Which would be the 2nd choice.
58943
Simply removing them from the DHCP table will not kick them off the internet. DHCP or Dynamic Host Configuration Protocol provides an address to a client (host) when it first connects and then periodically there after. Just removing the entry from the table does not remove the address from the client.\n\nFor security, use one or more of the other security options mentioned in an earlier answer.
118505
In truth, you really shouldn't have any need to use IPv6; Thanks to subnetting, even large corporations are stocked on IP addresses, which is the big reason for the advent of IPv6---more internet-routable IP addresses.\n\nHowever, being a computer geek myself, I'm certainly not above doing something for the sole purpose of saying I tried it; if I'm not mistaken, newer routers offer suppport for IPv6, though I'm not sure if the built-in DHCP servers most router/switch combos have these days support handing out IPv6 addresses.\n\nIf this is just a project to try out and see if you can accomplish, you might try getting your hands on a trial version of one of the server OS's (such as Windows Server 2003), and installing it on a box with two NICs in it, and letting it act as your router.  I know Server 2003 support IPv6, and I just tried installing it; however, I'm not even sure the native Server 2003 DHCP server will hand out IPv6 addresses to the DHCP clients, and I really don't know enough about the IPv6 address scheme, as it seems to have no Subnet Mask, to tell you how to assign IPv6 address statically.\n\nIf, indeed, this is not actually just to try, but to actually run IPv6, I should point out that even with a server rig capable of handing out IPv6 address to DHCP clients, it will still have to translate those IPv6 addresses back into IPv4 (though NAT or something similar, should NAT not conform to IPv6), since that's what your cable modem will be using, not to mention pretty much 99% of websites out there...\n\nA cool project to try, but if you're considering IPv6 to be "up to date", my advice is to just stick with IPv4, it's going to be WAAAY cheaper and easier to manage, let alone set up.
964682
this is the subnet mask no....mine also same\nThe subnet mask is used to determine where the network number in an IP address ends and the node number in an IP address begins. A node is anything on a network that needs an IP address to communicate (a PC, server, router, etc).\nfor more details google it\nsubnet: A segment of a larger network.\n\nsubnet mask: A bit mask that separates the portions of an IP address significant to the network from the bits significant to the subnet. For a class C address, a standard subnet mask is 255.255.255.0, which masks the first three bytes of the address, and leaves the last byte available to identify machines on the subnet.  \nso u should allow that....\nvisit here \nhttp://www.pantz.org/networking/tcpip/subnetchart.shtml\n\n\ni'm giving u more details\nUsing DHCP with Internet Connection Sharing TCP/IP requires that each computer on a network have a unique number called an IP address. If you have two network adapters on your computer, each must have a different IP address. For example, when you connect to the Internet, your DSL or cable modem will have a different IP address than the network adapter connected to your home or small office network.\n\nIP numbers are hierarchical. A number called a subnet mask is used with the IP address to enable the segmentation of a large network into smaller networks. It is important for you to remember the specific set of numbers used in your home network.\n\nThere are groups of IP addresses specifically reserved for small networks. One of these groups is used by residential gateways and by Internet Connection Sharing (ICS) - 192.168.0.x where x represents a number between 0 and 255.\n\nThese numbers are used with a subnet mask of 255.255.255.0. This particular subnet mask is known as a Class C subnet. \n\nUnderstanding the IP addressing scheme and using it appropriately can be difficult. Residential gateways and Internet Connection Sharing (ICS) automate the IP numbering task for the ICS client computers on your network by using the Dynamic Host Configuration Protocol (DHCP) service. The DHCP service enables the residential gateway or the ICS host computer to assign IP addresses to client computers automatically. By default, when a residential gateway or ICS is installed, the DHCP service begins supplying addresses to computers on the network.\n\nYour Internet service provider (ISP) might use a DHCP service to assign your computer an IP address when you connect to the Internet. This is commonly referred to as a dynamic IP address. Each time your computer connects to the Internet, a different but unique number might be assigned to it.\n\nWhen you install ICS, assuming that you have two adapters in the computer—one for the device connecting you to the Internet and another for connecting to your home or small office network - an IP address of 192.168.0.1 is assigned to the network adapter connected to your home network. This is assigned permanently and is referred to as a static IP address because it does not change. Next, the DHCP service is loaded into memory so that IP addresses can be assigned to computers on the network.\n\nEach client computer must request an address. It is important that the ICS host computer remain on all the time or be started prior to starting the other computers on your network. Otherwise, the client computers will be unable to obtain an IP address.
62187
well the IP addresses are managed by ICANN, making sure there are no duplicate IP addresses, but the addresses that we use on our pc is assigned by our ISPs or the company's system administrator.\n\nthe lowest IP address is 0.0.0.0 and the highest is 255.255.255.255. there are several classes concerning IP address, there's class a which ranges from 1.0.0.0 to 127.255.255.255, class b from 128.0.0.0 to 191.255.255.255, class c from 192.0.0.0 to 223.255.255.255, class d, which is used for multicasting, is from 224.0.0.0 to 239.255.255.255 and the last is class e, which reserved for future usage, is from 240.0.0.0 to 255.255.255.255.\n\nthe IP address 0.0.0.0 is used by hosts when they are being booted. IP adresses with 0 as network number refer to the current network,  for example, a company has a network number of 127.1.0.0, and i have a computer with an IP address of 127.1.1.1 that means that my computer is under the network of that company. an address consisting of all 1s are used for broadcasting on a local network, and addresses that starts with 127.xx.yy.zz are used for loopback settings, packets sent to that address are not sent out and is treated as incoming packets.\n\nbasically it is hard to make up your own IP address coz you might be having a duplicate address and the packets the you should be receiving might be received by another computer
445992
I think your misunderstanding.  A dynamic ip address is not what you want, it changes everytime you log on.  and its not your address you need to worry about, its the address of wherever your connecting to.  I am not familier with the site no-ip.com, but if it wants you to mess with ip adresses I would be a little suspicious.
374363
U have contact ur service providers to do that. Anyhow there r waysto cahnge ur ip address, but it won't be recognized on the service provider network. U got to have full knowledge of what u r doing to do so.
45383
You can opt for two types of IP Addresses. One is Static and the other is dynamic. Normally people don't have static ip's because you have to pay a big sum of money to have it (You IP Address never changes in this) So We all have dynamic, and everytime you connect yourself to the internet the ISP allocates a unique IP Address which changes everytime.\n\nThis is soley with Desktop computers. And in the case of Laptops when you go to different places, your subnet mask changes and you have to have a different IP in that place. So it changes
482467
21 is the subnet mask and not the port no.. For more info on IP address go to \n\nwww.learntosubnet.com
157516
I don't think you can.  It would be a good experiment.  Give them all ip addresses like, 192.168.1.1, 192.168.1.2 and 192.168.1.3 and a subnet mask of 255.255.255.0.  Make sure they are in the same workgroup and give it a try.  Good luck.