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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 156.70.180.0/22 | 1k | ARIN |  US | 19th Dec 1991 |
| 156.70.192.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.20.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.216.0/21 | 2k | ARIN | US | 19th Dec 1991 |
| 156.70.224.0/20 | 4.1k | ARIN | US | 22nd Jan 2020 |
| 156.70.240.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.248.0/21 | 2k | ARIN | US | 19th Dec 1991 |
| 156.70.26.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.28.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.32.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.36.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.40.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.44.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.54.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.56.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.70.6.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.74.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.78.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.90.0/23 | 512 | ARIN | US | 19th Dec 1991 |
| 156.70.92.0/22 | 1k | ARIN | US | 19th Dec 1991 |
| 156.79.0.0/16 | 65.5k | ARIN | US | 19th Dec 1991 |
| 156.81.0.0/16 | 65.5k | ARIN | US | 19th Dec 1991 |
| 156.82.0.0/16 | 65.5k | ARIN | US | 19th Dec 1991 |
| 156.97.0.0/16 | 65.5k | LACNIC |  CL | 23rd Dec 1991 |
| 157.10.118.0/23 | 512 | APNIC |  CN | 10th Jan 2024 |
| 157.10.126.0/23 | 512 | APNIC |  BT | 10th Jan 2024 |
| 157.10.130.0/23 | 512 | APNIC | CN | 10th Jan 2024 |
| 157.10.16.0/23 | 512 | APNIC |  ID | 30th Dec 2023 |
| 157.10.165.0/24 | 256 | APNIC |  NZ | 12th Jan 2024 |
| 157.10.181.0/24 | 256 | APNIC | ID | 12th Jan 2024 |
| 157.10.204.0/24 | 256 | APNIC |  IN | 15th Jan 2024 |
| 157.10.205.0/24 | 256 | APNIC | ID | 16th Jan 2024 |
| 157.10.218.0/23 | 512 | APNIC | CN | 18th Jan 2024 |
| 157.10.220.0/23 | 512 | APNIC | CN | 18th Jan 2024 |
| 157.10.237.0/24 | 256 | APNIC | ID | 19th Jan 2024 |
| 157.10.246.0/23 | 512 | APNIC | CN | 19th Jan 2024 |
| 157.10.36.0/23 | 512 | APNIC | CN | 2nd Jan 2024 |
| 157.10.40.0/24 | 256 | APNIC | IN | 2nd Jan 2024 |
| 157.10.60.0/23 | 512 | APNIC | IN | 3rd Jan 2024 |
| 157.10.86.0/23 | 512 | APNIC |  VN | 8th Jan 2024 |
| 157.101.0.0/18 | 16.4k | APNIC |  JP | 8th Feb 1992 |
| 157.104.0.0/16 | 65.5k | APNIC | JP | 8th Feb 1992 |
| 157.106.0.0/16 | 65.5k | APNIC | JP | 8th Feb 1992 |
| 157.108.0.0/16 | 65.5k | APNIC | JP | 8th Feb 1992 |
| 157.11.0.0/16 | 65.5k | APNIC | JP | 13th Apr 1993 |
| 157.112.128.0/20 | 4.1k | APNIC | JP | 8th Feb 1992 |
| 157.112.96.0/23 | 512 | APNIC | JP | 8th Feb 1992 |
| 157.112.98.0/24 | 256 | APNIC | JP | 8th Feb 1992 |
| 157.115.0.0/16 | 65.5k | APNIC | JP | 8th Feb 1992 |
| 157.116.0.0/16 | 65.5k | APNIC | JP | 8th Feb 1992 |