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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 157.117.0.0/16 | 65.5k | APNIC |  JP | 8th Feb 1992 |
| 157.119.12.0/22 | 1k | APNIC |  CN | 21st Apr 2016 |
| 157.119.132.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.136.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.140.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.144.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.148.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.152.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.156.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.16.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 157.119.160.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.164.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 157.119.192.0/22 | 1k | APNIC | CN | 28th Apr 2016 |
| 157.119.196.0/22 | 1k | APNIC | CN | 28th Apr 2016 |
| 157.119.240.0/22 | 1k | APNIC | CN | 29th Apr 2016 |
| 157.119.8.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 157.120.160.0/19 | 8.2k | APNIC | JP | 8th Feb 1992 |
| 157.120.232.0/22 | 1k | APNIC | JP | 8th Feb 1992 |
| 157.121.0.0/16 | 65.5k | ARIN |  US | 19th Dec 1991 |
| 157.126.0.0/16 | 65.5k | ARIN | US | 2nd Jan 1992 |
| 157.14.192.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 157.14.2.0/23 | 512 | APNIC | JP | 15th Apr 1993 |
| 157.14.224.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 157.14.240.0/21 | 2k | ARIN | US | 26th Jun 2024 |
| 157.146.0.0/16 | 65.5k | ARIN | US | 10th Jan 1992 |
| 157.15.100.0/23 | 512 | APNIC | CN | 1st Feb 2024 |
| 157.15.102.0/23 | 512 | APNIC | CN | 1st Feb 2024 |
| 157.15.120.0/24 | 256 | APNIC |  ID | 3rd Feb 2024 |
| 157.15.126.0/23 | 512 | APNIC |  LA | 5th Feb 2024 |
| 157.15.130.0/23 | 512 | APNIC |  IN | 5th Feb 2024 |
| 157.15.132.0/23 | 512 | APNIC | IN | 5th Feb 2024 |
| 157.15.142.0/23 | 512 | APNIC |  MM | 6th Feb 2024 |
| 157.15.162.0/23 | 512 | APNIC | ID | 7th Feb 2024 |
| 157.15.167.0/24 | 256 | APNIC |  AU | 8th Feb 2024 |
| 157.15.170.0/23 | 512 | APNIC | ID | 7th Feb 2024 |
| 157.15.18.0/23 | 512 | APNIC |  VN | 23rd Jan 2024 |
| 157.15.184.0/23 | 512 | APNIC | ID | 8th Feb 2024 |
| 157.15.191.0/24 | 256 | APNIC |  SG | 9th Feb 2024 |
| 157.15.2.0/23 | 512 | APNIC | ID | 22nd Jan 2024 |
| 157.15.206.0/23 | 512 | APNIC | ID | 9th Feb 2024 |
| 157.15.213.0/24 | 256 | APNIC |  PH | 12th Feb 2024 |
| 157.15.214.0/23 | 512 | APNIC | ID | 9th Feb 2024 |
| 157.15.216.0/23 | 512 | APNIC | ID | 9th Feb 2024 |
| 157.15.24.0/23 | 512 | APNIC | IN | 23rd Jan 2024 |
| 157.15.254.0/23 | 512 | APNIC | JP | 13th Feb 2024 |
| 157.15.5.0/24 | 256 | APNIC | AU | 22nd Jan 2024 |
| 157.15.56.0/23 | 512 | APNIC | JP | 29th Jan 2024 |
| 157.15.68.0/24 | 256 | APNIC | ID | 29th Jan 2024 |
| 157.15.74.0/23 | 512 | APNIC | CN | 30th Jan 2024 |
| 157.15.84.0/23 | 512 | APNIC | VN | 31st Jan 2024 |