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Each Class A IPv4 block consists of 16,777,216 total addresses.
Here are a few interesting takeaways:
1. Hewlett-Packard owns 33,554,432 Class A IPv4 addresses, or 1/128 of the IPv4 space -- apparently more than the countries of India and China combined (unverified).
2. The U.S. Department of Defense owns 150,994,944 IPv4 addresses. What the DoD is doing with almost 151 million IPv4 addresses is beyond me. I don't think anyone, or any country, in their right mind needs 150 million IPv4 addresses.
3. Massachusetts Institute of Technology owns 16,777,216 IPv4 addresses. No college needs almost 17 million IPv4 addresses for itself. According to Wikipedia, by comparison, some organizations such as Stanford University (formerly owner of the 36.0.0.0 - 36.255.255.255 range), have returned their designated ranges due to IP address shortages in recent years. Perhaps MIT should follow Stanford's lead?
4. The IANA has reserved approximately 251,658,240 IPv4 /8 addresses. I know some blocks are reserved for special use, but perhaps the IANA could release some of those blocks back to the world? We have a serious IPv4 shortage on our hands. Why is the IANA holding onto more than 250 million IPv4 addresses?
As of 7/29/09, here is a somewhat complete the list of Class A /8 IPv4 holders:
* 1.0.0.0/8: Reserved by IANA
* 2.0.0.0/8: Reserved by IANA
* 3.0.0.0/8: General Electric Company
* 4.0.0.0/8: Level 3 Communications
* 5.0.0.0/8: Reserved by IANA
* 6.0.0.0/8: U.S. Army Information Systems Engineering Command
* 7.0.0.0/8: U.S. Department of Defense
* 8.0.0.0/8: Level 3 Communications
* 9.0.0.0/8: IBM Corporation
* 10.0.0.0/8: Reserved by IANA
* 11.0.0.0/8: U.S. Department of Defense
* 12.0.0.0/8: AT&T
* 13.0.0.0/8: Xerox Corporation
* 14.0.0.0/8: Reserved by IANA
* 15.0.0.0/8: Hewlett-Packard Company
* 16.0.0.0/8: Hewlett-Packard Company
* 17.0.0.0/8: Apple Computer
* 18.0.0.0/8: Massachusetts Institute of Technology
* 19.0.0.0/8: Ford Motor Company
* 20.0.0.0/8: Computer Sciences Corporation
* 21.0.0.0/8: U.S. Department of Defense
* 22.0.0.0/8: U.S. Department of Defense
* 23.0.0.0/8: Reserved by IANA
* 24.0.0.0/8: Comcast Cable Communications
* 25.0.0.0/8: Royal Signals and Radar Establishment (UK)
* 26.0.0.0/8: U.S. Department of Defense
* 27.0.0.0/8: Reserved by IANA
* 28.0.0.0/8: U.S. Department of Defense
* 29.0.0.0/8: U.S. Department of Defense
* 30.0.0.0/8: U.S. Department of Defense
* 31.0.0.0/8: Reserved by IANA
* 32.0.0.0/8: AT&T
* 33.0.0.0/8: U.S. Department of Defense
* 34.0.0.0/8: Haliburton Company
* 35.0.0.0/8: Merit Network Inc.
* 36.0.0.0/8: Reserved by IANA
* 37.0.0.0/8: Reserved by IANA
* 38.0.0.0/8: PSINet, Inc.
* 39.0.0.0/8: Reserved by IANA
* 40.0.0.0/8: Eli Lilly and Company
* 41.0.0.0/8: Assigned to Africa, allocated by African Network Information Center
* 42.0.0.0/8: Reserved by IANA
* 43.0.0.0/8: Assigned to Japan; allocated by Asia Pacific Network Information Center
* 44.0.0.0/8: Amateur Radio Digital Communications
* 45.0.0.0/8: Interop Show Network
* 46.0.0.0/8: Reserved by IANA
* 47.0.0.0/8: Bell-Northern Research
* 48.0.0.0/8: The Prudential Insurance Company of America
* 49.0.0.0/8: Reserved by IANA
* 50.0.0.0/8: Reserved by IANA
* 51.0.0.0/8: UK Government Department for Work and Pensions
* 52.0.0.0/8: E.I. du Pont de Nemours and Co., Inc.
* 53.0.0.0/8: cap debis ccs (Germany)
* 54.0.0.0/8: Merck and Co., Inc.
* 55.0.0.0/8: U.S. Army Information Systems Engineering Command
* 56.0.0.0/8: United States Postal Service
* 57.0.0.0/8: Societe Internationale de Telecommunications Aeronautiques (France)
* 58.0.0.0/8: Assigned to Asia; allocated by Asia Pacific Network Information Center
* 59.0.0.0/8: Assigned to Asia; allocated by Asia Pacific Network Information Center
* 60.0.0.0/8: Assigned to Asia; allocated by Asia Pacific Network Information Center
* 61.0.0.0/8: Assigned to Asia; allocated by Asia Pacific Network Information Center
* 62.0.0.0/8: Assigned to Europe; allocated by European Registry
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