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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks registered through APNIC
22,595 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 27.133.64.0/20 | 4.1k | APNIC |  JP | 21st Apr 2010 |
| 27.133.80.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.133.88.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.16.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.134.189.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.134.190.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.192.0/19 | 8.2k | APNIC | JP | 21st Apr 2010 |
| 27.134.20.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.224.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.134.232.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.134.236.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.238.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.72.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.134.96.0/19 | 8.2k | APNIC | JP | 21st Apr 2010 |
| 27.135.57.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.135.58.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.135.60.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.135.64.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.135.72.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.248.0.0/14 | 262k | APNIC |  IN | 24th Mar 2010 |
| 27.253.0.0/17 | 32.8k | APNIC |  AU | 22nd Mar 2011 |
| 27.254.0.0/23 | 512 | APNIC |  TH | 16th Mar 2010 |
| 27.254.184.0/24 | 256 | APNIC | TH | 16th Mar 2010 |
| 27.254.229.0/24 | 256 | APNIC | TH | 16th Mar 2010 |
| 27.34.192.0/19 | 8.2k | APNIC | JP | 25th Mar 2010 |
| 27.34.232.0/21 | 2k | APNIC |  CN | 12th Apr 2011 |
| 27.50.40.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 27.54.144.0/22 | 1k | APNIC |  BD | 14th Dec 2015 |
| 27.54.152.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 27.54.192.0/18 | 16.4k | APNIC | CN | 25th Mar 2010 |
| 27.54.72.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 27.96.160.0/19 | 8.2k | APNIC |  KR | 19th May 2010 |
| 27.98.194.0/23 | 512 | APNIC | IN | 28th Oct 2026 |
| 27.98.196.0/23 | 512 | APNIC | IN | 28th Oct 2026 |
| 27.98.198.0/23 | 512 | APNIC | IN | 28th Oct 2026 |
| 27.98.202.0/23 | 512 | APNIC | CN | 28th Oct 2026 |
| 27.98.204.0/23 | 512 | APNIC | IN | 28th Oct 2026 |
| 27.98.208.0/20 | 4.1k | APNIC | CN | 25th May 2010 |
| 27.99.0.0/17 | 32.8k | APNIC | AU | 24th May 2010 |
| 31.99.144.0/21 | 2k | APNIC |  US | 25th Nov 2010 |
| 36.0.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 36.0.128.0/17 | 32.8k | APNIC | CN | 9th Mar 2011 |
| 36.0.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 36.0.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 36.0.4.0/22 | 1k | APNIC |  NP | 16th Mar 2011 |
| 36.0.64.0/18 | 16.4k | APNIC | CN | 11th Mar 2011 |
| 36.0.8.0/21 | 2k | APNIC | CN | 28th Jan 2011 |
| 36.254.0.0/16 | 65.5k | APNIC | CN | 31st Jan 2011 |
| 36.255.120.0/22 | 1k | APNIC | JP | 18th Feb 2016 |
| 36.255.124.0/22 | 1k | APNIC |  SG | 18th Feb 2016 |