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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,431 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 142.202.176.0/22 | 1k | ARIN |  US | 4th Feb 2020 |
| 142.202.184.0/24 | 256 | ARIN | US | 18th Dec 2019 |
| 142.202.199.0/24 | 256 | ARIN | US | 8th Jan 2020 |
| 142.202.236.0/22 | 1k | ARIN | US | 27th Dec 2019 |
| 142.202.4.0/22 | 1k | ARIN | US | 18th Dec 2019 |
| 142.202.66.0/24 | 256 | ARIN | US | 14th Jan 2020 |
| 142.202.8.0/24 | 256 | ARIN | US | 19th Dec 2019 |
| 142.202.81.0/24 | 256 | ARIN | US | 19th Dec 2019 |
| 142.202.89.0/24 | 256 | ARIN | US | 20th Dec 2019 |
| 142.208.0.0/16 | 65.5k | ARIN |  CA | 26th Oct 1992 |
| 142.209.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.210.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.211.0.0/16 | 65.5k | ARIN | CA | 26th Oct 1992 |
| 142.212.0.0/16 | 65.5k | ARIN | CA | 27th Oct 1992 |
| 142.218.0.0/16 | 65.5k | ARIN | CA | 15th Oct 1993 |
| 142.220.0.0/16 | 65.5k | ARIN | CA | 28th Oct 1992 |
| 142.223.0.0/16 | 65.5k | ARIN | CA | 10th Mar 1993 |
| 142.224.0.0/16 | 65.5k | ARIN | CA | 24th Mar 1994 |
| 142.226.0.0/16 | 65.5k | ARIN | CA | 18th Oct 1993 |
| 142.228.0.0/23 | 512 | ARIN | CA | 30th Dec 1992 |
| 142.228.11.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.127.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.13.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.130.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.133.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.135.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.150.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.153.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.170.0/23 | 512 | ARIN | CA | 30th Dec 1992 |
| 142.228.180.0/23 | 512 | ARIN | CA | 30th Dec 1992 |
| 142.228.2.0/23 | 512 | ARIN | CA | 17th Aug 2026 |
| 142.228.24.0/24 | 256 | ARIN | US | 29th Sept 2026 |
| 142.228.25.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.28.0/24 | 256 | ARIN | US | 29th Sept 2026 |
| 142.228.29.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.31.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.35.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.44.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.48.0/22 | 1k | ARIN | US | 11th Aug 2026 |
| 142.228.58.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.59.0/24 | 256 | ARIN | CA | 16th Oct 2026 |
| 142.228.60.0/22 | 1k | ARIN | US | 24th Aug 2026 |
| 142.228.66.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.73.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 142.228.88.0/23 | 512 | ARIN | CA | 30th Dec 1992 |
| 142.235.0.0/16 | 65.5k | ARIN | CA | 6th May 1993 |
| 142.248.108.0/23 | 512 | ARIN | US | 14th Oct 2025 |
| 142.248.110.0/24 | 256 | ARIN | US | 10th Oct 2025 |
| 142.248.112.0/22 | 1k | ARIN | US | 14th Oct 2025 |
| 142.248.12.0/22 | 1k | ARIN | CA | 10th Oct 2025 |