I know that 192.168.0.0/16 are adresses reserved for private networks. What about 192.169.0.0/16 addresses and other.. in 192.0.0.0/8. Are they routable in the "Internet" or are they also private?
5 Answers
These reserved IP-ranges for private networks are defined in RFC1918. 192.169.0.0/16 is not in them. You can verify using a WHOIS service that this /16 is divided into a number of smaller assignments to various networks.
No it isn't. See RFC6890 for all Special-Purpose IP Address Ranges (IPv4 and IPv6)
What about 192.169.0.0/16?
This is valid address space, and the addresses are routable, they are NOT private.
What about other addresses in 192.0.0.0/8?
You'd have to verify with WHOIS, some of the networks other than 192.168.0.0/16 within the 192.0.0.0/8 range are also private.
You could check anything you like in the future from just about an Linux distribution command line via the WHOIS tool:
whois 192.0.0.0/8
whois x.x.x.x/yy
Example of valid address space:
NetRange: 192.0.0.0 - 192.255.255.255
CIDR: 192.0.0.0/8
NetName: NET192
NetHandle: NET-192-0-0-0-0
Parent: ()
NetType: Early Registrations, Maintained by ARIN
OriginAS:
Organization: Various Registries (Maintained by ARIN) (VR-ARIN)
RegDate: 1993-05-01
Updated: 2010-06-30
Ref: http://whois.arin.net/rest/net/NET-192-0-0-0-0
OrgName: Various Registries (Maintained by ARIN)
OrgId: VR-ARIN
Address: 3635 Concord Parkway, Suite 200
City: Chantilly
StateProv: VA
PostalCode: 20151
Country: US
RegDate: 1993-05-01
Updated: 2011-09-24
Comment: Address space was assigned by the InterNIC regardless of
Comment: geographic region. The registrations are now being maintained
Comment: by various registries, and the in-addr.arpa delegations are
Comment: being maintained by ARIN.
Ref: http://whois.arin.net/rest/org/VR-ARIN
Example of private address space:
Internet Assigned Numbers Authority PRIVATE-ADDRESS-CBLK-RFC1918-IANA-RESERVED (NET-192-168-0-0-1) 192.168.0.0 - 192.168.255.255
Various Registries (Maintained by ARIN) NET192 (NET-192-0-0-0-0) 192.0.0.0 - 192.255.255.255
From RFC1918 Section 3:
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
192.168.0.0/16 is the only private address space in 192.0.0.0/8. 192.0.0.0/24 is used by IANA, 192.0.2.0/24 is reserved for documentation and examples, and 192.88.99.0/24 is for 6to4 anycast.
See: http://en.wikipedia.org/wiki/Reserved_IP_addresses https://www.arin.net/knowledge/address_filters.html
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2Actually, there are several ranges in the 192.0.0.0/8 that are not routed on the Internet: 192.0.2.0/24 (Test Net 1).– Ron Maupin ♦Mar 25, 2015 at 20:00
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I'm surprised ARIN would get this wrong but you are right, at least according to wikipedia: en.wikipedia.org/wiki/Reserved_IP_addresses Mar 25, 2015 at 20:03
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1This is an IANA document: iana.org/assignments/iana-ipv4-special-registry/…– Ron Maupin ♦Mar 25, 2015 at 20:05
I know that 192.168.0.0/16 are adresses reserved for private networks.
Yes
What about 192.169.0.0/16 addresses
Those are regular public IPv4 addreseses allocated to various networks.
and other.. in 192.0.0.0/8. Are they routable in the "Internet" or are they also private?
Most of the block is regular public IPs but there are a number of special things in there. Special allocations are documented at http://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
192.0.0.0/24 is reserved for IETF protocol assignments.
192.0.0.0/29 is reserved for clients of ds-lite 464xlat and similar
192.0.0.8/32 is reserved as a dummy address for 4rd
192.0.0.9/32 is an anycast address for "port control protcol"
192.0.0.170/32 and 192.0.0.171/32 are used for DNS64 discovery
192.0.2.0/24 is reserved for documentation, examples etc
192.31.196.0/24 is used for "AS112 Redirection Using DNAME"
192.52.193.0/24 is used for "Automatic Multicast Tunneling"
192.88.99.0/24 is used as an anycast prefix for 6to4 relays
192.168.0.0/16 is private use
192.175.48.0/24 is Direct Delegation AS112 Service