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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 54.30.0.0/16 | 65.5k | ARIN |  US | 17th Mar 1992 |
| 54.31.0.0/16 | 65.5k | ARIN | US | 10th Mar 2023 |
| 54.32.0.0/15 | 131k | ARIN | US | 26th Sept 2022 |
| 54.34.0.0/16 | 65.5k | ARIN | US | 7th Nov 2022 |
| 54.4.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.40.0.0/15 | 131k | ARIN | US | 17th Mar 1992 |
| 54.42.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.44.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.45.0.0/16 | 65.5k | ARIN | US | 10th Mar 2023 |
| 54.48.0.0/14 | 262k | ARIN | US | 17th Mar 1992 |
| 54.52.0.0/15 | 131k | ARIN | US | 17th Mar 1992 |
| 54.56.0.0/15 | 131k | ARIN | US | 17th Mar 1992 |
| 54.58.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.59.0.0/16 | 65.5k | ARIN | US | 27th Jun 2023 |
| 54.6.0.0/15 | 131k | ARIN | US | 27th Dec 2021 |
| 54.60.0.0/16 | 65.5k | ARIN | US | 10th Mar 2023 |
| 54.61.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.62.0.0/16 | 65.5k | ARIN | US | 17th Mar 1992 |
| 54.63.0.0/16 | 65.5k | ARIN | US | 27th Jun 2023 |
| 54.9.0.0/16 | 65.5k | ARIN | US | 27th Jun 2023 |
| 54.96.0.0/14 | 262k | ARIN | US | 17th Mar 1992 |
| 56.111.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.113.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 56.114.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 56.115.0.0/16 | 65.5k | ARIN | US | 14th Mar 2023 |
| 56.120.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.128.0.0/16 | 65.5k | ARIN | US | 30th Aug 2022 |
| 56.129.0.0/16 | 65.5k | ARIN | US | 14th Mar 2023 |
| 56.130.0.0/15 | 131k | ARIN | US | 14th Mar 2023 |
| 56.135.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.138.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 56.139.0.0/16 | 65.5k | ARIN | US | 14th Mar 2023 |
| 56.140.0.0/14 | 262k | ARIN | US | 2nd Nov 1992 |
| 56.148.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.156.0.0/15 | 131k | ARIN | US | 24th Jun 2022 |
| 56.158.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.159.0.0/16 | 65.5k | ARIN | US | 30th Aug 2022 |
| 56.162.0.0/16 | 65.5k | ARIN | US | 14th Mar 2023 |
| 56.164.0.0/16 | 65.5k | ARIN | US | 9th Dec 2022 |
| 56.170.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.175.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.179.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.181.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.184.0.0/16 | 65.5k | ARIN | US | 24th Jun 2022 |
| 56.185.0.0/16 | 65.5k | ARIN | US | 14th Mar 2023 |
| 56.186.0.0/15 | 131k | ARIN | US | 9th Dec 2022 |
| 56.189.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.192.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.198.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |
| 56.201.0.0/16 | 65.5k | ARIN | US | 2nd Nov 1992 |