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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 160.191.94.0/23 | 512 | APNIC |  VN | 24th Oct 2024 |
| 160.191.96.0/23 | 512 | APNIC | VN | 24th Oct 2024 |
| 160.191.98.0/23 | 512 | APNIC | VN | 24th Oct 2024 |
| 160.195.0.0/16 | 65.5k | APNIC |  JP | 24th Jul 1992 |
| 160.196.0.0/16 | 65.5k | APNIC | JP | 24th Jul 1992 |
| 160.20.121.0/24 | 256 | APNIC |  BD | 21st May 2024 |
| 160.20.130.0/23 | 512 | APNIC |  CN | 23rd May 2024 |
| 160.20.140.0/23 | 512 | APNIC | JP | 22nd May 2024 |
| 160.20.143.0/24 | 256 | APNIC |  PG | 27th May 2024 |
| 160.20.16.0/23 | 512 | APNIC | CN | 16th May 2024 |
| 160.20.213.0/24 | 256 | AFRINIC |  CI | 28th Feb 2020 |
| 160.20.217.0/24 | 256 | AFRINIC | CI | 28th Feb 2020 |
| 160.20.218.0/23 | 512 | LACNIC |  VE | 20th Mar 2018 |
| 160.20.221.0/24 | 256 | AFRINIC | CI | 28th Feb 2020 |
| 160.20.236.0/22 | 1k | ARIN |  US | 22nd Jan 2020 |
| 160.20.250.0/24 | 256 | APNIC |  ID | 30th May 2024 |
| 160.20.251.0/24 | 256 | ARIN | US | 6th Sept 2018 |
| 160.20.48.0/22 | 1k | APNIC | CN | 4th Mar 2016 |
| 160.20.76.0/23 | 512 | APNIC | ID | 16th May 2024 |
| 160.20.78.0/24 | 256 | APNIC | ID | 16th May 2024 |
| 160.201.0.0/16 | 65.5k | APNIC | JP | 27th Jul 1992 |
| 160.202.148.0/22 | 1k | APNIC | CN | 31st Mar 2016 |
| 160.202.176.0/22 | 1k | APNIC |  KR | 1st Apr 2016 |
| 160.202.216.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 160.202.220.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 160.202.48.0/22 | 1k | APNIC |  IN | 11th Mar 2016 |
| 160.203.0.0/16 | 65.5k | APNIC | JP | 27th Jul 1992 |
| 160.205.0.0/16 | 65.5k | ARIN | US | 2nd Jun 1997 |
| 160.21.0.0/18 | 16.4k | APNIC | JP | 25th Jun 1992 |
| 160.21.104.0/21 | 2k | RIPE NCC | JP | 11th Mar 2026 |
| 160.21.112.0/20 | 4.1k | RIPE NCC | JP | 11th Mar 2026 |
| 160.21.128.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 160.21.144.0/20 | 4.1k | RIPE NCC | JP | 11th Mar 2026 |
| 160.21.160.0/21 | 2k | APNIC | JP | 25th Jun 1992 |
| 160.21.168.0/21 | 2k | RIPE NCC | JP | 11th Mar 2026 |
| 160.21.176.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 160.21.192.0/18 | 16.4k | APNIC | JP | 25th Jun 1992 |
| 160.21.64.0/20 | 4.1k | RIPE NCC | JP | 11th Mar 2026 |
| 160.21.80.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 160.21.96.0/21 | 2k | APNIC | JP | 25th Jun 1992 |
| 160.213.0.0/19 | 8.2k | RIPE NCC |  CH | 1st Sept 1993 |
| 160.213.102.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.104.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.108.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.112.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.148.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.152.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.172.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.176.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 160.213.192.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |