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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,041 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 169.248.0.0/14 | 262k | ARIN |  US | 9th Jul 1996 |
| 169.255.156.0/22 | 1k | AFRINIC |  CI | 28th Feb 2020 |
| 169.255.16.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 169.255.192.0/22 | 1k | AFRINIC |  ZA | 8th May 2015 |
| 169.255.84.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 169.255.9.0/24 | 256 | AFRINIC |  KE | 27th Aug 2014 |
| 169.36.0.0/15 | 131k | RIPE NCC |  CH | 1st Sept 1993 |
| 169.39.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.41.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.42.0.0/15 | 131k | RIPE NCC | CH | 1st Sept 1993 |
| 169.49.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.52.0.0/16 | 65.5k | RIPE NCC | CH | 1st Sept 1993 |
| 169.64.0.0/10 | 4.2M | ARIN | US | 25th Aug 1993 |
| 170.0.4.0/22 | 1k | ARIN | US | 11th Jan 2022 |
| 170.1.0.0/16 | 65.5k | ARIN | US | 30th Nov 1993 |
| 170.10.76.0/22 | 1k | ARIN | US | 27th Jan 2022 |
| 170.10.80.0/22 | 1k | ARIN | US | 27th Jan 2022 |
| 170.100.0.0/17 | 32.8k | ARIN | US | 21st Dec 2022 |
| 170.100.132.0/22 | 1k | ARIN | US | 24th Mar 1994 |
| 170.100.136.0/21 | 2k | ARIN | US | 24th Mar 1994 |
| 170.100.144.0/23 | 512 | ARIN | US | 24th Mar 1994 |
| 170.100.146.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 170.100.147.0/24 | 256 | RIPE NCC | US | 24th Mar 1994 |
| 170.100.205.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 170.100.216.0/21 | 2k | ARIN | US | 24th Mar 1994 |
| 170.101.64.0/19 | 8.2k | ARIN | US | 21st Jan 2026 |
| 170.102.0.0/18 | 16.4k | ARIN | US | 29th Mar 1994 |
| 170.102.64.0/19 | 8.2k | ARIN | US | 29th Mar 1994 |
| 170.102.96.0/20 | 4.1k | ARIN | US | 29th Mar 1994 |
| 170.107.0.0/16 | 65.5k | ARIN | US | 7th Apr 1994 |
| 170.113.0.0/16 | 65.5k | ARIN | US | 13th Apr 1994 |
| 170.117.128.0/19 | 8.2k | ARIN | US | 18th Apr 1994 |
| 170.117.160.0/23 | 512 | ARIN | US | 18th Apr 1994 |
| 170.117.200.0/24 | 256 | ARIN | US | 18th Apr 1994 |
| 170.117.204.0/22 | 1k | ARIN | US | 1st Feb 2024 |
| 170.117.208.0/23 | 512 | ARIN | US | 18th Apr 1994 |
| 170.117.210.0/24 | 256 | ARIN | US | 18th Apr 1994 |
| 170.117.251.0/24 | 256 | ARIN | US | 18th Apr 1994 |
| 170.118.0.0/17 | 32.8k | ARIN | US | 4th Aug 2015 |
| 170.118.192.0/19 | 8.2k | ARIN | US | 18th Apr 1994 |
| 170.118.240.0/21 | 2k | ARIN | US | 18th Apr 1994 |
| 170.126.0.0/16 | 65.5k | ARIN | US | 25th Apr 1994 |
| 170.127.0.0/16 | 65.5k | ARIN | US | 28th Apr 1994 |
| 170.13.0.0/17 | 32.8k | ARIN | US | 18th Dec 1993 |
| 170.13.128.0/18 | 16.4k | ARIN | US | 18th Dec 1993 |
| 170.13.192.0/19 | 8.2k | ARIN | US | 18th Dec 1993 |
| 170.13.224.0/20 | 4.1k | ARIN | US | 18th Dec 1993 |
| 170.13.240.0/22 | 1k | ARIN | US | 18th Dec 1993 |
| 170.13.244.0/23 | 512 | ARIN | US | 18th Dec 1993 |
| 170.13.247.0/24 | 256 | ARIN | US | 18th Dec 1993 |