IPv6 prefix
2620:4f:8000:0:0:0:0:0/48
Special-Purpose Address Block: Direct Delegation Autonomous System 112 (AS112) Service
- Public routing
- expected to be globally reachable
- IP Prefix (CIDR)
- 2620:4f:8000:0:0:0:0:0/48
- Address Count
- 1.2089 x 10^24
This block supports Autonomous System 112 (AS112), an anycast service that absorbs reverse DNS queries for address space that should not be sent to the public DNS root.
IANA marks this block globally reachable for its infrastructure role.
A system administrator may see it around reverse DNS infrastructure, sinkhole-style query handling, or packet captures involving misdirected private-address reverse lookups.
Firewall tip: treat it as anycast DNS infrastructure rather than an end-user network.
| Block | Name |
|---|---|
| 0:0:0:0:0:0:0:1/128 | Loopback |
| 0:0:0:0:0:0:0:0/128 | Unspecified Address |
| 0:0:0:0:0:ffff:0:0/96 | IPv4-Mapped Address |
| 64:ff9b:0:0:0:0:0:0/96 | Network Address Translation 64 (NAT64) Well-Known Prefix |
| 64:ff9b:1:0:0:0:0:0/48 | Network Address Translation 64 (NAT64) Local-Use Prefix |
| 100:0:0:0:0:0:0:0/64 | Discard-Only Address Block |
| 100:0:0:1:0:0:0:0/64 | Dummy IPv6 Prefix |
| 2001:0:0:0:0:0:0:0/23 | IETF (Internet Engineering Task Force) Protocol Assignments |
| 2001:0:0:0:0:0:0:0/32 | Teredo |
| 2001:1:0:0:0:0:0:1/128 | Port Control Protocol (PCP) Anycast |
| 2001:1:0:0:0:0:0:2/128 | Traversal Using Relays around NAT (TURN) Anycast |
| 2001:1:0:0:0:0:0:3/128 | DNS-SD Service Registration Protocol Anycast |
| 2001:2:0:0:0:0:0:0/48 | Benchmarking |
| 2001:3:0:0:0:0:0:0/32 | Automatic Multicast Tunneling (AMT) |
| 2001:4:112:0:0:0:0:0/48 | Autonomous System 112 (AS112) Service |
| 2001:10:0:0:0:0:0:0/28 | Deprecated Overlay Routable Cryptographic Hash Identifiers (ORCHID) |
| 2001:20:0:0:0:0:0:0/28 | Overlay Routable Cryptographic Hash Identifiers Version 2 (ORCHIDv2) |
| 2001:30:0:0:0:0:0:0/28 | Drone Remote ID Protocol Entity Tags (DETs) |
| 2001:db8:0:0:0:0:0:0/32 | Documentation (RFC 3849) |
| 2002:0:0:0:0:0:0:0/16 | 6to4 |
| 3fff:0:0:0:0:0:0:0/20 | Documentation (RFC 9637) |
| 5f00:0:0:0:0:0:0:0/16 | Segment Routing over IPv6 (SRv6) Segment Identifiers |
| fc00:0:0:0:0:0:0:0/7 | Unique Local Address |
| fe80:0:0:0:0:0:0:0/10 | Link-Local Unicast |
| 0:0:0:0:0:0:0:0/8 | Reserved by IETF (Internet Engineering Task Force) |
| 0:0:0:0:0:0:0:0/96 | Deprecated IPv4-Compatible IPv6 Prefix |
| fec0:0:0:0:0:0:0:0/10 | Deprecated Site-Local Unicast |
| ff00:0:0:0:0:0:0:0/8 | Multicast |
| Announced Prefix | Relationship | Origin ASN | Description | Country | First Address | Last Address |
|---|---|---|---|---|---|---|
| 2620:4f:8000:0:0:0:0:0/48 | Exact | AS112 | Root Server Technical Operations Assn |
United States of America (US)
|
2620:4f:8000:0:0:0:0:0 | 2620:4f:8000:ffff:ffff:ffff:ffff:ffff |