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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 209.46.112.0/22 | 1k | ARIN |  US | 20th Jul 2023 |
| 209.46.128.0/17 | 32.8k | ARIN | US | 28th Apr 1997 |
| 209.46.16.0/21 | 2k | ARIN | US | 19th Jul 2023 |
| 209.46.34.0/23 | 512 | ARIN | US | 22nd Apr 1997 |
| 209.46.36.0/24 | 256 | ARIN | US | 22nd Apr 1997 |
| 209.46.4.0/22 | 1k | ARIN | US | 26th Feb 2025 |
| 209.46.40.0/21 | 2k | ARIN | US | 19th Jul 2023 |
| 209.46.60.0/22 | 1k | ARIN | US | 20th Jul 2023 |
| 209.46.72.0/21 | 2k | ARIN | US | 19th Jul 2023 |
| 209.46.80.0/20 | 4.1k | ARIN | US | 19th Jul 2023 |
| 209.50.64.0/19 | 8.2k | ARIN |  CA | 22nd Dec 2000 |
| 209.54.192.0/18 | 16.4k | ARIN | US | 22nd Jun 2011 |
| 209.59.224.0/24 | 256 | ARIN | US | 12th Oct 2020 |
| 209.59.225.0/24 | 256 | ARIN | US | 20th Dec 2018 |
| 209.59.247.0/24 | 256 | ARIN | US | 12th Feb 2019 |
| 209.62.0.0/17 | 32.8k | ARIN | US | 19th Mar 2007 |
| 209.62.128.0/19 | 8.2k | ARIN | US | 2nd Mar 1999 |
| 209.62.176.0/20 | 4.1k | ARIN | CA | 6th Mar 2015 |
| 209.66.0.0/18 | 16.4k | ARIN | US | 7th Apr 1997 |
| 209.66.128.0/19 | 8.2k | ARIN | US | 14th Apr 1997 |
| 209.66.224.0/19 | 8.2k | ARIN | US | 2nd Jun 2000 |
| 209.74.96.0/21 | 2k | ARIN | US | 26th Jun 2000 |
| 209.82.128.0/19 | 8.2k | ARIN | US | 15th May 1997 |
| 209.87.170.0/24 | 256 | ARIN | US | 7th Apr 1999 |
| 209.90.192.0/19 | 8.2k | ARIN | US | 6th May 2004 |
| 209.92.32.0/22 | 1k | ARIN | US | 12th May 2025 |
| 209.92.70.0/23 | 512 | ARIN | US | 4th Jun 1997 |
| 209.94.49.0/24 | 256 | ARIN | US | 13th Sept 2022 |
| 209.94.71.0/24 | 256 | ARIN | US | 18th Jul 2022 |
| 209.94.78.0/24 | 256 | ARIN | US | 22nd Dec 2017 |
| 209.94.92.0/23 | 512 | ARIN | US | 22nd Dec 2017 |
| 209.95.160.0/19 | 8.2k | ARIN | US | 26th Sept 1997 |
| 209.95.192.0/19 | 8.2k | ARIN | US | 3rd Oct 1997 |
| 209.95.64.0/19 | 8.2k | ARIN | US | 19th Aug 1997 |
| 209.97.96.0/20 | 4.1k | ARIN | US | 23rd Mar 2001 |
| 209.99.128.0/20 | 4.1k | ARIN | US | 16th Jul 1997 |
| 209.99.168.0/21 | 2k | ARIN | US | 26th Jun 2026 |
| 209.99.176.0/21 | 2k | ARIN | US | 24th Jul 2026 |
| 209.99.240.0/20 | 4.1k | ARIN | US | 6th Sept 2001 |
| 210.0.0.0/19 | 8.2k | APNIC |  AU | 9th Sept 1996 |
| 210.1.16.0/24 | 256 | APNIC |  TH | 23rd Nov 2000 |
| 210.111.112.0/20 | 4.1k | APNIC |  KR | 30th Apr 1997 |
| 210.111.64.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.112.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.128.0/19 | 8.2k | APNIC | KR | 30th Apr 1997 |
| 210.114.192.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.64.0/20 | 4.1k | APNIC | KR | 30th Apr 1997 |
| 210.114.80.0/21 | 2k | APNIC | KR | 30th Apr 1997 |
| 210.114.96.0/21 | 2k | APNIC | KR | 30th Apr 1997 |
| 210.115.0.0/19 | 8.2k | APNIC | KR | 30th Apr 1997 |