192.88.99.0/24 (Former 6to4 Relay Anycast (Deprecated))
ReservedRFC 7526
192.88.99.0/24 at a glance
| CIDR block | 192.88.99.0/24 |
|---|---|
| First address | 192.88.99.0 |
| Last address | 192.88.99.255 |
| Total addresses | 256 |
| Subnet mask | 255.255.255.0 |
| Prefix length | /24 |
| Type | Reserved |
| Publicly routable | No |
| Defined in | RFC 7526 |
Open in CIDR calculator/24 subnet details
What is 192.88.99.0/24 used for?
192.88.99.0/24 was the anycast range for 6to4 relay routers, used to tunnel IPv6 over IPv4. RFC 7526 deprecated 6to4 anycast in 2015, and the block should not be used for new deployments.
FAQ
Is 6to4 still used?
Rarely. RFC 7526 deprecated the 6to4 anycast relay in 2015 because relays were unreliable. Use native IPv6 or a managed tunnel instead.
Can 192.88.99.0/24 be reused?
It remains reserved. Its 6to4 use is deprecated, but it has not been returned for general allocation.