Internet Services
- Each host can establish a different connection on one of its
ports. There are 65536 ports. Some are reserved:
- telnet: 23
- http: 80
- ftp: 21
- smtp: 25
- A class C address reserve the first 3 bytes (e.g.,
199.1.2.*), while a class B reserves the first two (e.g.,
127.1.*.*).
- 10.*.*.*, 172.1.*.*, 172.31.*.*, 192.168.*.* are
nonroutable.
- 127.*.*.* is the loopback number.
- We are running out of IP numbers. IPv6 will add more bytes.
José M. Vidal
.
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