Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.47.44.0/24 | 256 | APNIC |  JP | 2nd Dec 1992 |
| 192.47.45.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.46.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.47.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.48.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.49.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.50.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.51.0/24 | 256 | APNIC | JP | 30th Nov 1992 |
| 192.47.52.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.53.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.54.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.55.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.56.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.57.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.58.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.59.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.60.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.61.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.62.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.63.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.72.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.73.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.74.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.75.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.76.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.77.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.78.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.79.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.8.0/21 | 2k | APNIC | JP | 12th Jan 1989 |
| 192.47.80.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.81.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.82.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.83.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.84.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.85.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.86.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.87.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.88.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.89.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.90.0/23 | 512 | APNIC | JP | 30th Dec 1992 |
| 192.47.92.0/23 | 512 | APNIC | JP | 30th Dec 1992 |
| 192.47.94.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.95.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.96.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.98.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.99.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.48.100.0/24 | 256 | ARIN |  US | 3rd Feb 1989 |
| 192.48.102.0/23 | 512 | ARIN | US | 4th Jan 2021 |
| 192.48.104.0/24 | 256 | ARIN | US | 6th Feb 1989 |
| 192.48.106.0/24 | 256 | ARIN | US | 6th Feb 1989 |