Indicates the status of address blocks as follows:
RESERVED: designated by the IETF for specific non-global-unicast purposes as noted.
LEGACY: allocated by the central Internet Registry (IR) prior to the Regional Internet Registries
(RIRs). This address space is now administered by individual RIRs as noted, including maintenance
of WHOIS Directory and reverse DNS records. Assignments from these blocks are distributed globally
on a regional basis.
ALLOCATED: delegated entirely to specific RIR as indicated.
UNALLOCATED: not yet allocated or reserved.

0.0.0.0/8 reserved for self-identification [RFC1122], section 3.2.1.3. 
Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv4-special-registry].

Reserved for Private-Use Networks [RFC1918].
Complete registration details for 10.0.0.0/8 are found in [IANA registry iana-ipv4-special-registry].

This was reserved for Public Data Networks [RFC1356]. See [IANA registry public-data-network-numbers].
It was recovered in February 2008 and was subsequently allocated to APNIC in April 2010.

100.64.0.0/10 reserved for Shared Address Space [RFC6598]. 
Complete registration details for 100.64.0.0/10 are found in [IANA registry iana-ipv4-special-registry].

127.0.0.0/8 reserved for Loopback [RFC1122], section 3.2.1.3. 
Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv4-special-registry].

169.254.0.0/16 reserved for Link Local [RFC3927].
Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv4-special-registry].

172.16.0.0/12 reserved for Private-Use Networks [RFC1918]. 
Complete registration details are found in [IANA registry iana-ipv4-special-registry].

192.0.2.0/24  reserved for TEST-NET-1 [RFC5737]. 
Complete registration details for 192.0.2.0/24 are found in [IANA registry iana-ipv4-special-registry].
192.88.99.0/24 reserved for 6to4 Relay Anycast [RFC3068]
Complete registration details for 192.88.99.0/24 are found in [IANA registry iana-ipv4-special-registry].
192.88.99.2/32 reserved for 6a44 Relay Anycast [RFC6751] (possibly collocated with 6to4 Relay 
at 192.88.99.1/32 - see [RFC3068] section 2.4)
192.168.0.0/16 reserved for Private-Use Networks [RFC1918]. 
Complete registration details for 192.168.0.0/16 are found in [IANA registry iana-ipv4-special-registry].

192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry [RFC5736]. 
Complete registration details for 192.0.0.0/24 are found in [IANA registry iana-ipv4-special-registry].

198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing [RFC2544]. 
Complete registration details for 198.18.0.0/15 are found in [IANA registry iana-ipv4-special-registry].
198.51.100.0/24 reserved for TEST-NET-2 [RFC5737]. 
Complete registration details for 198.51.100.0/24 are found in [IANA registry iana-ipv4-special-registry].

203.0.113.0/24 reserved for TEST-NET-3 [RFC5737]. 
Complete registration details for 203.0.113.0/24 are found in [IANA registry iana-ipv4-special-registry].

Multicast (formerly "Class D") [RFC5771] registered in [IANA registry multicast-addresses]

Unicast-Prefix-Based IPv4 Multicast Addresses [RFC6034]

Administratively Scoped IP Multicast [RFC2365]

Reserved for future use (formerly "Class E") [RFC1112].
Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv4-special-registry].

255.255.255.255 is reserved for "limited broadcast" destination address [RFC919] and [RFC922].
Complete registration details for 255.255.255.255/32 are found in [IANA registry iana-ipv4-special-registry].