IPv4 prefix
192.31.196.0/24
Special-Purpose Address Block: Autonomous System 112 (AS112) Service
- Public routing
- expected to be globally reachable
- IP Prefix (CIDR)
- 192.31.196.0/24
- Subnet Mask
- 255.255.255.0
- Address Count
- 256
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 |
|---|---|
| 0.0.0.0/8 | "This" Network |
| 0.0.0.0/32 | "This Host on This Network" |
| 10.0.0.0/8 | Private Use (RFC 1918) |
| 100.64.0.0/10 | Shared Address Space - CGN (Carrier-Grade Network Address Translation) |
| 127.0.0.0/8 | Loopback |
| 169.254.0.0/16 | Link-Local |
| 172.16.0.0/12 | Private Use (RFC 1918) |
| 192.0.2.0/24 | Documentation (TEST-NET-1) |
| 192.0.0.0/24 | IETF (Internet Engineering Task Force) Protocol Assignments |
| 192.0.0.0/29 | IPv4 Service Continuity Prefix |
| 192.0.0.8/32 | IPv4 Dummy Address |
| 192.0.0.9/32 | Port Control Protocol (PCP) Anycast |
| 192.0.0.10/32 | Traversal Using Relays around NAT (TURN) Anycast |
| 192.0.0.170/32 | NAT64/DNS64 Discovery |
| 192.0.0.171/32 | NAT64/DNS64 Discovery |
| 192.52.193.0/24 | Automatic Multicast Tunneling (AMT) |
| 192.88.99.0/24 | Deprecated 6to4 Relay Anycast |
| 192.88.99.2/32 | 6a44 Relay Anycast Address |
| 192.168.0.0/16 | Private Use (RFC 1918) |
| 192.175.48.0/24 | Direct Delegation Autonomous System 112 (AS112) Service |
| 198.18.0.0/15 | Benchmarking |
| 198.51.100.0/24 | Documentation (TEST-NET-2) |
| 203.0.113.0/24 | Documentation (TEST-NET-3) |
| 224.0.0.0/4 | Multicast |
| 240.0.0.0/4 | Reserved |
| 255.255.255.255/32 | Limited Broadcast |
| Announced Prefix | Relationship | Origin ASN | Description | Country | First Address | Last Address |
|---|---|---|---|---|---|---|
| 192.31.196.0/24 | Exact | AS112 | DNS-OARC |
United States of America (US)
|
192.31.196.0 | 192.31.196.255 |