195

Link-local addresses do not provide services outside the local network. However, many client/server and peer-to-peer applications will work properly with IPv4 link-local addresses on the local network.

Test-Net Addresses

The test-net addresses are set aside for teaching and learning purposes. This is the address block 192.0.2.0 /24 (192.0.2.0 to 192.0.2.255). These addresses can be used in documenta-tion and network examples. Unlike the experimental addresses, network devices will accept the test-net addresses in their configurations. You can often find these addresses used with the domain names example.com or example.net in RFCs and vendor and protocol documen-tation. Addresses within this block should not appear on the Internet.

Table 6-12 is a summary of the reserved and special-purpose IPv4 addresses presented in this section. These do not represent all the special address blocks used in IPv4 networks. Additionally, the status of these blocks can be changed. You should consult the RFCs for any changes.

Table 6-12       Major Reserved and Special-Purpose IPv4 Addresses

Type	Block	Range	Reference
Multicast	224.0.0.0 /4	224.0.0.0–239.255.255.255	RFC 1700
Network	—	—	One per network
address
Broadcast	—	—	One per network
address			plus 255.255.255.255
Experimental	240.0.0.0 /4	240.0.0.0–255.255.255.254	RFC 3330
addresses
Private space	10.0.0.0 /8	10.0.0.0–10.255.255.255	RFC 1918
addresses	172.16.0.0 /12	172.16.0.0–172.31.255.255
	192.168.0.0 /16	192.168.0.0–192.168.255.255
Default route	0.0.0.0 /8	0.0.0.0–0.255.255.255	RFC 1700
Loopback	127.0.0.0 /8	127.0.0.0–127.255.255.255	RFC 1700
Link-local	169.254.0.0 /16	169.254.0.0–169.254.255.255	RFC 3927
addresses
Test-net	192.0.2.0 /24	192.0.2.0–192.0.2.255	—
addresses