Reserved IP addresses

Reserved IP addresses
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In the Internet addressing architecture, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) have reserved various Internet Protocol (IP) addresses for special purposes. These IP addresses may be used for maintenance of routing tables, multicast, operation under failure modes, or to provide addressing space for public, unrestricted uses.
The IETF sets the guidelines for use of the IP address space in RFC specifications, and directs IANA to implement the policies. Reserved IP addresses tend to belong to three categories: addresses that are globally unique, addresses that are unique to the subnet, and addresses that are only relevant to the host using the address.[citation needed]

Contents  [hide]

• 1 Reserved IPv4 addresses
• 2 Reserved IPv6 addresses
• 3 References
  

Reserved IPv4 addresses[edit]

CIDR	Address Range	Number of Addresses	Scope	Purpose
0.0.0.0/8	0.0.0.0 – 0.255.255.255	16,777,216	software	Used for broadcast messages to the current ("this") network as specified by RFC 1700, page 4.
10.0.0.0/8	10.0.0.0 – 10.255.255.255	16,777,216	private network	Used for local communications within a private network as specified by RFC 1918.
100.64.0.0/10	100.64.0.0 – 100.127.255.255	4,194,304	private network	Used for communications between a service provider and its subscribers when using a Carrier-grade NAT, as specified by RFC 6598.
127.0.0.0/8	127.0.0.0 – 127.255.255.255	16,777,216	host	Used for loopback addresses to the local host, as specified by RFC 990.
169.254.0.0/16	169.254.0.0 – 169.254.255.255	65,536	subnet	Used for link-local addresses between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server, as specified by RFC 3927.
172.16.0.0/12	172.16.0.0 – 172.31.255.255	1,048,576	private network	Used for local communications within a private network as specified by RFC 1918
192.0.0.0/24	192.0.0.0 – 192.0.0.255	256	private network	Used for the IANA IPv4 Special Purpose Address Registry as specified by RFC 5736
192.0.2.0/24	192.0.2.0 – 192.0.2.255	256	documentation	Assigned as "TEST-NET" in RFC 5737 for use solely in documentation and example source code and should not be used publicly.
192.88.99.0/24	192.88.99.0 – 192.88.99.255	256	Internet	Used by 6to4 anycast relays as specified by RFC 3068.
192.168.0.0/16	192.168.0.0 – 192.168.255.255	65,536	private network	Used for local communications within a private network as specified by RFC 1918.
198.18.0.0/15	198.18.0.0 – 198.19.255.255	131,072	private network	Used for testing of inter-network communications between two separate subnets as specified in RFC 2544.
198.51.100.0/24	198.51.100.0 – 198.51.100.255	256	documentation	Assigned as "TEST-NET-2" in RFC 5737 for use solely in documentation and example source code and should not be used publicly.
203.0.113.0/24	203.0.113.0 – 203.0.113.255	256	documentation	Assigned as "TEST-NET-3" in RFC 5737 for use solely in documentation and example source code and should not be used publicly.
224.0.0.0/4	224.0.0.0 – 239.255.255.255	268,435,456	Internet	Reserved for multicast assignments as specified in RFC 5771. 233.252.0.0/24 is assigned as "MCAST-TEST-NET" for use solely in documentation and example source code.
240.0.0.0/4	240.0.0.0 – 255.255.255.254	268,435,455	n/a	Reserved for future use, as specified by RFC 6890.
255.255.255.255/32	255.255.255.255	1	n/a	Reserved for the "limited broadcast" destination address, as specified by RFC 6890.

Reserved IPv6 addresses[edit]

CIDR	Address Range	Number of Addresses	scope	Purpose
::/128	::	1	software	Unspecified address
::1/128	::1	1	host	loopback address to the local host.
::ffff:0:0/96	::ffff:0.0.0.0 – ::ffff:255.255.255.255	232	software	IPv4 mapped addresses
100::/64	100:: – 100::ffff:ffff:ffff:ffff	264		Discard Prefix RFC 6666
64:ff9b::/96	64:ff9b::0.0.0.0 – 64:ff9b::255.255.255.255	232	global Internet[1	IPv4/IPv6 translation (RFC 6052)
2001::/32	2001:: – 2001::ffff:ffff:ffff:ffff:ffff:ffff	296	global	Teredo tunneling
2001:10::/28	2001:10:: – 2001:1f:ffff:ffff:ffff:ffff:ffff:ffff	2100	software	Deprecated (previously ORCHID)
2001:20::/28	2001:20:: – 2001:2f:ffff:ffff:ffff:ffff:ffff:ffff	2100	software	ORCHIDv2
2001:db8::/32	2001:db8:: – 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff	296	documentation	Addresses used in documentation
2002::/16	2002:: – 2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2112	global Internet	6to4
fc00::/7	fc00:: – fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2121	private network	Unique local address
fe80::/10	fe80:: - febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2118	link	Link-local address
ff00::/8	ff00:: – ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2120	global Internet	Multicast

References[edit]

• RFC 5635
• [1]
• RFC 6890
• IANA IPv4 Special-Purpose Address Registry
• IANA IPv6 Special-Purpose Address Registry
  

• Jump up ^ RFC 6052 section 3.2
  

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