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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,709 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 101.234.80.0/20 | 4.1k | APNIC |  CN | 12th Apr 2011 |
| 101.234.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.244.0.0/16 | 65.5k | APNIC | CN | 10th Jan 2011 |
| 101.251.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.251.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.251.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.36.0.0/18 | 16.4k | APNIC | CN | 14th Dec 2010 |
| 101.48.0.0/16 | 65.5k | APNIC | CN | 10th Dec 2010 |
| 101.54.0.0/16 | 65.5k | APNIC | CN | 16th Dec 2010 |
| 101.55.224.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.55.67.0/24 | 256 | APNIC |  KR | 10th Feb 2011 |
| 101.78.32.0/19 | 8.2k | APNIC | CN | 11th Mar 2011 |
| 101.79.128.0/21 | 2k | APNIC | KR | 17th Dec 2010 |
| 101.79.138.0/23 | 512 | APNIC | KR | 17th Dec 2010 |
| 101.79.140.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.176.0/21 | 2k | APNIC | KR | 17th Dec 2010 |
| 101.79.184.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.188.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.192.0/20 | 4.1k | APNIC | KR | 17th Dec 2010 |
| 101.79.252.0/23 | 512 | APNIC | KR | 17th Dec 2010 |
| 101.79.4.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.40.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.44.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.48.0/20 | 4.1k | APNIC | KR | 17th Dec 2010 |
| 101.79.76.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.88.0/22 | 1k | APNIC | KR | 17th Dec 2010 |
| 101.79.96.0/19 | 8.2k | APNIC | KR | 17th Dec 2010 |
| 101.96.0.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.96.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.97.128.0/17 | 32.8k | APNIC |  JP | 7th Apr 2011 |
| 101.99.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 102.128.192.0/18 | 16.4k | AFRINIC |  NG | 16th Jan 2019 |
| 102.130.0.0/21 | 2k | AFRINIC | NG | 5th Apr 2021 |
| 102.130.97.0/24 | 256 | AFRINIC |  ZA | 21st Dec 2018 |
| 102.131.32.0/22 | 1k | AFRINIC |  EG | 1st Oct 2018 |
| 102.134.28.0/22 | 1k | AFRINIC |  GA | 17th Aug 2018 |
| 102.135.184.0/22 | 1k | AFRINIC |  CI | 14th Aug 2018 |
| 102.164.123.0/24 | 256 | AFRINIC |  GH | 13th Apr 2018 |
| 102.165.176.0/22 | 1k | AFRINIC | ZA | 21st Feb 2018 |
| 102.176.188.0/22 | 1k | AFRINIC |  SL | 16th Mar 2018 |
| 102.201.164.0/22 | 1k | AFRINIC | NG | 11th Aug 2026 |
| 102.201.170.0/24 | 256 | AFRINIC | GH | 11th Aug 2026 |
| 102.201.171.0/24 | 256 | AFRINIC |  TZ | 11th Aug 2026 |
| 102.201.172.0/22 | 1k | AFRINIC |  UG | 10th Aug 2026 |
| 102.201.176.0/22 | 1k | AFRINIC | GH | 6th Aug 2026 |
| 102.201.180.0/22 | 1k | AFRINIC |  DZ | 6th Aug 2026 |
| 102.201.184.0/22 | 1k | AFRINIC | NG | 31st Jul 2026 |
| 102.201.188.0/22 | 1k | AFRINIC | ZA | 31st Jul 2026 |
| 102.201.192.0/23 | 512 | AFRINIC | CI | 30th Jul 2026 |
| 102.201.194.0/23 | 512 | AFRINIC |  KE | 6th Aug 2026 |