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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 157.66.212.0/23 | 512 | APNIC |  ID | 6th May 2024 |
| 157.66.214.0/23 | 512 | APNIC | ID | 6th May 2024 |
| 157.66.228.0/23 | 512 | APNIC | ID | 6th May 2024 |
| 157.66.230.0/23 | 512 | APNIC | ID | 7th May 2024 |
| 157.66.232.0/23 | 512 | APNIC | ID | 7th May 2024 |
| 157.66.234.0/23 | 512 | APNIC | ID | 7th May 2024 |
| 157.66.244.0/23 | 512 | APNIC |  CN | 8th May 2024 |
| 157.66.42.0/23 | 512 | APNIC | CN | 29th Mar 2024 |
| 157.66.52.0/23 | 512 | APNIC | ID | 1st Apr 2024 |
| 157.66.6.0/24 | 256 | APNIC | ID | 22nd Mar 2024 |
| 157.66.70.0/23 | 512 | APNIC | CN | 3rd Apr 2024 |
| 157.66.82.0/23 | 512 | APNIC | ID | 5th Apr 2024 |
| 157.66.88.0/23 | 512 | APNIC | CN | 9th Apr 2024 |
| 157.66.90.0/23 | 512 | APNIC | CN | 9th Apr 2024 |
| 157.66.92.0/23 | 512 | APNIC | CN | 9th Apr 2024 |
| 157.66.94.0/23 | 512 | APNIC | CN | 10th Apr 2024 |
| 157.68.0.0/16 | 65.5k | APNIC |  JP | 10th Feb 1992 |
| 157.69.0.0/16 | 65.5k | APNIC | JP | 10th Feb 1992 |
| 157.70.0.0/17 | 32.8k | RIPE NCC |  US | 2nd Oct 1992 |
| 157.70.128.0/19 | 8.2k | APNIC | JP | 10th Feb 1992 |
| 157.8.120.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.128.0/19 | 8.2k | APNIC | JP | 21st Apr 1993 |
| 157.8.16.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.160.0/22 | 1k | APNIC | JP | 21st Apr 1993 |
| 157.8.200.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.208.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.224.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.240.0/22 | 1k | APNIC | JP | 21st Apr 1993 |
| 157.8.32.0/19 | 8.2k | APNIC | JP | 21st Apr 1993 |
| 157.8.64.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.8.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.88.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.85.128.0/18 | 16.4k | APNIC |  AU | 16th Dec 1991 |
| 157.87.0.0/16 | 65.5k | ARIN | US | 16th Dec 1991 |
| 157.9.0.0/16 | 65.5k | APNIC | JP | 13th Apr 1993 |
| 157.96.112.0/22 | 1k | RIPE NCC |  SE | 7th Apr 2004 |
| 157.96.12.0/23 | 512 | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.124.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.152.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.16.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.160.0/21 | 2k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.176.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.192.0/19 | 8.2k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.224.0/20 | 4.1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.24.0/23 | 512 | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.240.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.248.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.252.0/22 | 1k | ARIN | US | 30th Mar 2020 |
| 157.96.32.0/24 | 256 | RIPE NCC | SE | 7th Apr 2004 |
| 157.96.34.0/23 | 512 | RIPE NCC | SE | 7th Apr 2004 |