IP Addresses
B-3
Asia Pacific Network Information Centre
(APNIC-DOM)
Attention:
Asia Pacific Network
Information Centre
(APNIC-DOM)
c/o Computer Centre
University of Tokyo
2-11-16 Yayoi
Bunkyo-ku, Tokyo 113
Japan
Admin. Contact:
Nakayama, Masaya (MN89)
Telephone:
+81 3 3812 2111 ext2720
e-mail:
Technical Contact:
Conrad, David (DC396)
Telephone:
+81 3 3580 3781
or +81 3 3580 3784
Fax:
+81 3 3580 3782
e-mail:
How IP Addresses Work
To make internet addressing easier to understand, IP
addresses are written in dotted decimal notation, for
example:
191.0.0.72
(10111111.00000000.00000000.01001000 in binary)
The IP address field is affected by:
■
Classes
■
Subnets
Classes
Depending on the Class (or type) of the IP address,
there are many ways that the address field can be
divided into a network number and a device number.
The number used to convey how an IP address is
divided is determined by the most significant bits in
the 32-bit address field.
There are four classes of IP addresses. Each address
class begins with a unique bit pattern, which is used
by the Internet software residing on your devices to
identify the address class.
16710.bk : IPADDRES.FRM Page 3 Tuesday, October 7, 1997 11:38 AM
