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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,936 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2001:df1:7f44::/46 | 262k × /64 | APNIC |  US | 28th Jan 2026 |
| 2001:df1:7f48::/45 | 524k × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:7f50::/44 | 1M × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:7f60::/43 | 2.1M × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:81c0::/48 | 65.5k × /64 | APNIC | US | 9th Nov 2022 |
| 2001:df1:ec0::/48 | 65.5k × /64 | APNIC | US | 27th Jul 2022 |
| 2001:df2:a300::/48 | 65.5k × /64 | APNIC | US | 27th Sept 2017 |
| 2001:df2:fc80::/48 | 65.5k × /64 | APNIC | US | 26th Feb 2020 |
| 2001:df3:45c0::/48 | 65.5k × /64 | APNIC | US | 12th Dec 2023 |
| 2001:df3:46c0::/48 | 65.5k × /64 | APNIC | US | 12th Dec 2023 |
| 2001:df3:4b00::/48 | 65.5k × /64 | APNIC | US | 28th Nov 2017 |
| 2001:df3:b580::/48 | 65.5k × /64 | APNIC | US | 12th May 2020 |
| 2001:df3:da00::/48 | 65.5k × /64 | APNIC | US | 5th Aug 2016 |
| 2001:df4:5b40::/48 | 65.5k × /64 | APNIC | US | 3rd Oct 2024 |
| 2001:df4:dc40::/48 | 65.5k × /64 | APNIC | US | 2nd Jan 2025 |
| 2001:df5:4100::/48 | 65.5k × /64 | APNIC | US | 28th May 2018 |
| 2001:df5:a980::/48 | 65.5k × /64 | APNIC | US | 24th Dec 2020 |
| 2001:df7:ac00::/48 | 65.5k × /64 | APNIC | US | 26th Nov 2015 |
| 201.19.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 201.24.192.0/20 | 4.1k | RIPE NCC | US | 13th Mar 2025 |
| 201.29.0.0/16 | 65.5k | ARIN | US | 27th May 2026 |
| 201.4.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.50.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.51.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.78.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.78.224.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.0.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.8.32.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 201.89.128.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.9.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 201.94.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 202.0.192.0/18 | 16.4k | APNIC | US | 19th Sept 1994 |
| 202.27.250.0/24 | 256 | ARIN | US | 23rd Jan 2023 |
| 202.4.164.0/24 | 256 | APNIC | US | 24th Sept 2009 |
| 202.43.91.0/24 | 256 | APNIC | US | 17th Aug 2016 |
| 202.74.55.0/24 | 256 | APNIC | US | 17th Aug 2016 |
| 202.81.16.0/20 | 4.1k | APNIC | US | 9th Jul 2010 |
| 202.86.4.0/22 | 1k | APNIC | US | 14th Mar 2006 |
| 202.87.28.0/22 | 1k | ARIN | US | 3rd Feb 2025 |
| 203.11.72.0/24 | 256 | ARIN | US | 10th Jul 2024 |
| 203.11.96.0/24 | 256 | APNIC | US | 12th Jan 1995 |
| 203.142.11.0/24 | 256 | APNIC | US | 12th May 2004 |
| 203.147.144.0/20 | 4.1k | ARIN | US | 22nd May 2024 |
| 203.184.64.0/20 | 4.1k | APNIC | US | 6th Mar 2001 |
| 203.191.36.0/22 | 1k | ARIN | US | 11th Dec 2023 |
| 203.217.137.0/24 | 256 | APNIC | US | 23rd Jun 2009 |
| 203.24.120.0/24 | 256 | ARIN | US | 9th Jun 2021 |
| 203.25.162.0/24 | 256 | APNIC | US | 25th Mar 1996 |
| 203.27.124.0/24 | 256 | ARIN | US | 23rd Feb 2026 |