Help with homework, 01/23/04. Please try to do it first without help.
It is important you can do this kind of web searches yourself.

RFC 1700 (Assigned Numbers, Oct 1994) gives information of all kind 
of Internet related ``Assigned Numbers''. RFC 1700 is one of a 
sequence: Every few year an updated ``Assigned Numbers'' RFC used to 
appear.

Use a simple search (editor, find) to find:

page 167 of RFC contains the following:

----

The following list of EtherTypes is contributed unverified information
from various sources.

Assignments:

Ethernet          Exp. Ethernet    Description          References
-------------     -------------   -----------           ----------
decimal  Hex      decimal  octal
   000   0000-05DC   -       -    IEEE802.3 Length Field   [XEROX]
   257   0101-01FF   -       -    Experimental             [XEROX]
   512   0200        512   1000   XEROX PUP (see 0A00)   [8,XEROX]
   513   0201        -      -     PUP Addr Trans (see 0A01)[XEROX]
         0400                     Nixdorf                  [XEROX]
  1536   0600       1536   3000   XEROX NS IDP         [133,XEROX]
         0660                     DLOG                     [XEROX]
         0661                     DLOG                     [XEROX]
  2048   0800        513   1001   Internet IP (IPv4)     [105,JBP]
  2049   0801        -      -     X.75 Internet            [XEROX]
  2050   0802        -      -     NBS Internet             [XEROX]
  2051   0803        -      -     ECMA Internet            [XEROX]

---

Thus, we know that in Oct 1994, the ethertype of IPv4 packets was 
0800 (in hexadec). (And of course this did not change).

RFC 3232 explains that the IETF will stop the ``Assigned Numbers'' 
sequence of RFCs, and that instead there will be an on-line database 
that will be kept up to date.
RFC 3232 gives a pointer to that on-line database.

If you used only RFC 1700, the response to my question would have been

---
         0660                     DLOG                     [XEROX]
         0661                     DLOG                     [XEROX]
  2048   0800        513   1001   Internet IP (IPv4)     [105,JBP]
  2049   0801        -      -     X.75 Internet            [XEROX]
  2050   0802        -      -     NBS Internet             [XEROX]
---

(5 lines, with the line that answers the question in the middle, 
plus two just preceding and two immediately following).

Now do the same from the up-to-date on-line database.

Of course you already know the answer. I want to make sure you can 
do simple web searches. From now on, you know how to find current
Internet Assigned Numbers.