192.0.0.0/24 (IETF Protocol Assignments)
ReservedRFC 6890
192.0.0.0/24 at a glance
| CIDR block | 192.0.0.0/24 |
|---|---|
| First address | 192.0.0.0 |
| Last address | 192.0.0.255 |
| Total addresses | 256 |
| Subnet mask | 255.255.255.0 |
| Prefix length | /24 |
| Type | Reserved |
| Publicly routable | No |
| Defined in | RFC 6890 |
Open in CIDR calculator/24 subnet details
What is 192.0.0.0/24 used for?
192.0.0.0/24 is reserved for IETF protocol assignments (RFC 6890). Specific addresses here have defined roles, such as 192.0.0.8 for IPv4 dummy addresses and 192.0.0.170–171 for NAT64 discovery. It is not for general use.
FAQ
What is 192.0.0.170 used for?
Together with 192.0.0.171 it is the well-known address hosts use to discover a NAT64 prefix (RFC 7050), via a DNS lookup of ipv4only.arpa.
Can I assign addresses from 192.0.0.0/24?
No. The block is reserved for specific IETF protocol uses; individual addresses are listed in the IANA special-purpose registry.