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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.98.55.0/24 | 256 | APNIC |  SG | 1st Aug 2017 |
| 103.98.56.0/22 | 1k | APNIC |  CN | 1st Aug 2017 |
| 103.98.78.0/24 | 256 | APNIC |  IN | 2nd Aug 2017 |
| 103.98.80.0/22 | 1k | APNIC | CN | 3rd Aug 2017 |
| 103.98.88.0/22 | 1k | APNIC | CN | 3rd Aug 2017 |
| 103.99.112.0/23 | 512 | APNIC |  ID | 23rd Aug 2017 |
| 103.99.116.0/22 | 1k | APNIC | CN | 24th Aug 2017 |
| 103.99.120.0/22 | 1k | APNIC | CN | 24th Aug 2017 |
| 103.99.152.0/22 | 1k | APNIC | CN | 25th Aug 2017 |
| 103.99.164.0/22 | 1k | APNIC | ID | 28th Aug 2017 |
| 103.99.220.0/22 | 1k | APNIC | CN | 30th Aug 2017 |
| 103.99.226.0/24 | 256 | APNIC |  AU | 30th Aug 2017 |
| 103.99.232.0/22 | 1k | APNIC | CN | 31st Aug 2017 |
| 103.99.236.0/22 | 1k | APNIC | CN | 31st Aug 2017 |
| 103.99.56.0/22 | 1k | APNIC | CN | 21st Aug 2017 |
| 103.99.65.0/24 | 256 | APNIC | AU | 22nd Aug 2017 |
| 103.99.66.0/23 | 512 | APNIC | IN | 4th Aug 2022 |
| 103.99.84.0/23 | 512 | APNIC | ID | 22nd Aug 2017 |
| 104.128.176.0/24 | 256 | ARIN |  US | 5th Apr 2021 |
| 104.128.68.0/23 | 512 | ARIN | US | 11th Apr 2024 |
| 104.129.224.0/20 | 4.1k | ARIN | US | 24th Jun 2014 |
| 104.143.12.0/22 | 1k | ARIN | US | 13th Sept 2019 |
| 104.152.192.0/22 | 1k | ARIN | US | 4th Aug 2014 |
| 104.152.8.0/21 | 2k | ARIN | US | 9th Jul 2014 |
| 104.153.164.0/23 | 512 | ARIN |  IT | 6th Aug 2014 |
| 104.153.167.0/24 | 256 | ARIN |  CA | 15th Feb 2018 |
| 104.153.20.0/22 | 1k | ARIN | US | 25th Jul 2014 |
| 104.153.200.0/22 | 1k | ARIN | US | 11th Aug 2014 |
| 104.153.88.0/22 | 1k | ARIN | US | 15th Apr 2025 |
| 104.156.128.0/22 | 1k | ARIN | US | 3rd Oct 2023 |
| 104.156.192.0/19 | 8.2k | ARIN | US | 17th Jul 2014 |
| 104.160.230.0/24 | 256 | ARIN | CA | 4th Sept 2019 |
| 104.160.246.0/24 | 256 | ARIN | US | 31st Oct 2019 |
| 104.160.80.0/20 | 4.1k | ARIN | US | 17th Sept 2014 |
| 104.162.0.0/16 | 65.5k | ARIN | US | 28th Jul 2014 |
| 104.166.110.0/23 | 512 | ARIN | US | 6th Jul 2021 |
| 104.166.123.0/24 | 256 | ARIN | US | 7th Jan 2022 |
| 104.166.99.0/24 | 256 | ARIN | US | 7th Jan 2022 |
| 104.167.17.0/24 | 256 | RIPE NCC |  DE | 22nd Aug 2014 |
| 104.167.220.0/22 | 1k | ARIN | US | 7th Jan 2021 |
| 104.167.245.0/24 | 256 | ARIN | US | 6th Jan 2021 |
| 104.170.0.0/16 | 65.5k | ARIN | US | 10th Oct 2014 |
| 104.192.144.0/22 | 1k | ARIN | CA | 5th Sept 2014 |
| 104.192.152.0/22 | 1k | ARIN | CA | 5th Sept 2014 |
| 104.192.172.0/22 | 1k | ARIN | CA | 8th Sept 2014 |
| 104.192.194.0/23 | 512 | ARIN | US | 22nd Aug 2022 |
| 104.192.30.0/24 | 256 | ARIN | US | 30th Oct 2024 |
| 104.192.73.0/24 | 256 | ARIN | US | 24th Apr 2017 |
| 104.193.112.0/22 | 1k | ARIN | US | 18th Sept 2014 |
| 104.193.16.0/21 | 2k | ARIN | US | 15th Sept 2014 |