How do I know if my IP address is...

[Trente]

1st class?

What exactly does it say about it?

TIA!

 

[SpunkyJones]

1st Class??? What are you refering too? Do you mean if its a public or private address or what class it is?

 

[Garion]

There are some odd exceptions (loopback, multicast, etc.) but in general, from a functional perspective, IP addresses fall into two categories:


1: Private IP addresses that are used behind firewalls, SOHO routers, etc that do NAT to get to the Internet. These generally start with 10.x.x.x, 172.16 - 172.31.x.x or 192.168.x.x.

2: Public IP's, that are fully routable on the Internet Generally all IP's that aren't private in the private range (with the exception of 127.x.x.x for loopback)

There are "classes" of public IP's, but those just define how big of a block is given out. A "Class C" is 255 IP's. A "Class B" is 65,000+, a "Class A" is just huge (16 million + IP's, 1/256th of all the Internet IP's available). In general, just ignore the "class" of your address. It means nothing to you or anyone else.

- G

 

[Trente]

Yeah, I meant class A/B/C; sorry for the error in my post (that is, reffering to it as 1st/2nd/3rd class), I got confused... 10x for the answer Garion.

 

[Night201]

What's the first octec of your IP Address?

???.xxx.xxx.xxx

What is the ??? number?

 

[Trente]

80

 

[nightowl]

IP address in the range of 1-127 are class A addresses. Class B addresses are 128-191 and class C addresses are 192-223. Now there are some address ranges in the above groups that are not used on the Internet but most of them are.

Edit: As Garion said the class of the address does not mean much anymore. The original classes of addresses have been chopped up so much do to subnetting to make more efficient use of the available addresses that there is no real use for the address classes. Except for some routing uses but that is another matter.