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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 41.79.12.0/22 | 1k | AFRINIC |  CI | 28th Feb 2020 |
| 41.79.140.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.79.152.0/22 | 1k | AFRINIC |  NG | 9th Dec 2011 |
| 41.79.72.0/22 | 1k | AFRINIC |  ZA | 1st Jul 2011 |
| 41.79.84.0/22 | 1k | AFRINIC | CI | 28th Feb 2020 |
| 41.84.160.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.87.32.0/19 | 8.2k | AFRINIC | CI | 28th Feb 2020 |
| 41.92.180.0/22 | 1k | AFRINIC |  CM | 24th Oct 2009 |
| 41.92.196.0/22 | 1k | AFRINIC | CM | 24th Oct 2009 |
| 42.0.0.0/22 | 1k | APNIC |  CN | 14th Apr 2011 |
| 42.0.16.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.0.24.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.0.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.0.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.1.0.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.1.128.0/17 | 32.8k | APNIC | CN | 10th Mar 2011 |
| 42.1.32.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.1.48.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.1.56.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.123.0.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.123.128.0/17 | 32.8k | APNIC | CN | 16th Mar 2011 |
| 42.123.36.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.123.40.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.123.48.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.128.0.0/12 | 1M | APNIC | CN | 16th Feb 2011 |
| 42.156.0.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.156.36.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.156.40.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.156.48.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.156.64.0/18 | 16.4k | APNIC | CN | 12th Apr 2011 |
| 42.160.0.0/12 | 1M | APNIC | CN | 16th Feb 2011 |
| 42.187.0.0/18 | 16.4k | APNIC | CN | 12th Apr 2011 |
| 42.187.112.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.187.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.187.96.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.194.0.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.194.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.194.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.194.64.0/18 | 16.4k | APNIC | CN | 12th Apr 2011 |
| 42.194.8.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.195.0.0/16 | 65.5k | APNIC | CN | 17th Mar 2011 |
| 42.201.0.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.201.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.201.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.204.0.0/14 | 262k | APNIC | CN | 18th Mar 2011 |
| 42.208.0.0/12 | 1M | APNIC | CN | 16th Feb 2011 |
| 42.241.0.0/16 | 65.5k | APNIC |  AU | 22nd Mar 2011 |
| 42.50.0.0/16 | 65.5k | APNIC | CN | 16th Mar 2011 |
| 42.62.128.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.62.160.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |