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IP address ranges

An IP address is a unique 32-bit address that is used to address a host computer. Normally it is written as a fours sets of positive numbers (0-255) delimited by dots, such as

216.239.57.99
Here is a table indicating use according to the first of these numbers, i.e. the most significant 8 bits of the address:
0-2: reserved
5: reserved
7: reserved
10: local
11-22: various
23: reserved
24-26: various (ARIN)
27: reserved
28-30: various
41: AFRINIC
43: IP6 / Japan
58-61: APNIC
62: RIPE
63-76: various (ARIN)
80-94: RIPE
95-115: reserved
112-125: APNIC
126: APNIC (BBTEC, Japan)
127: local
128-172: various allocations
173-190: reserved
189-190: LACNIC
191: reserved
192: various allocations 193-195: RIPE
196: AFRINIC
200-201: LACNIC
202-203: APNIC
204-209: USA
210-211: APNIC
212-213: RIPE
216: USA
217: RIPE
218-222: APNIC
224-255: reserved
Explanation:

AFRINIC = Africa
APNIC = Asia / AU / NZ
ARIN = USA / Canada
LACNIC = Latin America / Caribbean
RIPE = Europe / Africa / Middle East
local: reserved for local net addresses (intranets)
reserved: not currently used

Ranges not explicitly mentioned are primarily allocated to ISPs in the USA / universities / corporates.

See also:
http://www.joewein.de/sw/blacklist/abuse.txt
http://www.iana.org/assignments/ipv4-address-space


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