home *** CD-ROM | disk | FTP | other *** search
-
-
- N-1-3-040.31.4, "Current Sizes of Major Global Networks", by
- John S. Quarterman, <jsq@tic.com>
-
-
- Note to the editor: *indicates italics*
-
-
- The *Matrix* is all the computer networks worldwide that exchange
- electronic mail or news. How many computers is that? No one knows
- for sure, but we can make a rough estimate by adding up the numbers of
- hosts on the biggest global networks. Numbers are available for
- BITNET, FidoNet, UUCP, the Internet, and USENET, for the end of July
- 1992. There are thousands of networks in the Matrix; these are not
- all of them. But these are the biggest networks in the Matrix, and
- the ones that probably contain most of the hosts.
-
- Numbers of Hosts on Some
- Global Networks in the Matrix
-
- network hosts
- _____________________________
- USENET 55,000
- _____________________________
- BITNET 3,477
- FidoNet 16,303
- UUCP 14,805
- The Internet 992,000
- Enterprise IP 600,000
- _____________________________
- Total 1,612,000
-
- July 1992
- Figures compiled by Matrix, Inc., Austin, Texas.
- +1-512-329-1087
- mids@tic.com
-
- BITNET, the IBM punchcard image leased line network that supports
- mail, chat, file sending, and a sophisticated mailing list mechanism,
- originally connected only IBM mainframes, but now includes many kinds
- of systems, especially VMS. It has a nodelist called BITEARN NODES,
- which lists 3,477 BITNET hosts.
-
- FidoNet, the dialup personal computer (mostly MS-DOS) network that
- provides mail and echomail (similar to USENET news), is defined by its
- nodelist, which lists every node on the network. There are currently
- 16,303 hosts in the FidoNet nodelist.
-
- UUCP, the dialup mail network that was originally all UNIX, but now
- has many MS-DOS and other hosts, has a node list called the UUCP map.
- Many UUCP hosts are not registered in the UUCP map, but it is safe to
- assume 50% to 75% of them are. There are 14,805 hosts registered in
- the UUCP map.
-
- The Internet, the network of more than 5,000 constituent networks that
- supports mail, news, remote login, file transfer, and numerous other
- services, has no central registry. However, it is possible to
- estimate its size by walking the DNS domain tree, and Mark Lottor of
- SRI has been doing this periodically for years (see RFC 1296,
- "Internet Growth (1981-1991)"). His latest results, for July 1992,
- show 992,000 hosts with IP addresses.
-
- Many companies have private internal enterprise networks that use IP
- but are deliberately firewalled from the Internet so that no one can
- connect in with services such as Telnet or FTP to most parts of them.
- The SRI results exclude most such IP enterprise networks, although
- they do include 96,963 hosts under hp.com, or, presumably, all of the
- HP Internet. The SRI figures do not include much of most other large
- IP enterprise networks, however. From adding up known sizes for
- several of the largest such networks, and guessing at the number of
- others, a conservative estimate would be about 600,000 hosts on such
- IP enterprise networks.
-
- USENET, the news-only virtual network, is carried on top of all of the
- other networks already mentioned. Brian Reid of Digital has been
- estimating its size for years, and his latest estimate shows 55,000
- hosts. These machines are presumably almost all already counted among
- the other networks, though, so we have to discard the USENET figure.
-
- Adding up these estimates for the various networks, we get more than a
- million and a half hosts in the Matrix, as shown in the table. For
- further information, see *Matrix News*, volume 2, numbers 2 and 7,
- which also include estimates of the numbers of users on the networks.
-