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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 1.4.1.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 1.4.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 1.4.2.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 1.4.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 1.4.4.0/24 | 256 | APNIC | CN | 31st Mar 2011 |
| 1.4.5.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 1.4.6.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 1.4.64.0/18 | 16.4k | APNIC | CN | 12th Apr 2011 |
| 1.4.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.0.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 101.0.224.0/19 | 8.2k | APNIC |  TW | 24th Dec 2010 |
| 101.0.39.0/24 | 256 | APNIC |  IN | 10th Dec 2010 |
| 101.0.40.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.0.41.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.0.46.0/23 | 512 | APNIC | IN | 10th Dec 2010 |
| 101.0.52.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.0.56.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.0.58.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.0.60.0/24 | 256 | APNIC | IN | 10th Dec 2010 |
| 101.101.100.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 101.101.102.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 101.101.104.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.101.112.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.101.176.0/20 | 4.1k | APNIC |  KR | 28th Feb 2011 |
| 101.101.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.102.100.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 101.102.102.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 101.102.104.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.102.112.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.102.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.110.116.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 101.110.120.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.110.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.110.96.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.120.0.0/14 | 262k | APNIC | CN | 13th Dec 2010 |
| 101.128.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.128.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.128.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.130.0.0/15 | 131k | APNIC | CN | 15th Dec 2010 |
| 101.196.0.0/16 | 65.5k | APNIC | CN | 4th Jan 2011 |
| 101.203.128.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.203.160.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.203.176.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.203.192.0/18 | 16.4k | APNIC |  JP | 8th Mar 2011 |
| 101.203.48.0/20 | 4.1k | APNIC | JP | 7th Mar 2011 |
| 101.203.80.0/22 | 1k | APNIC | JP | 7th Mar 2011 |
| 101.203.86.0/23 | 512 | APNIC | JP | 7th Mar 2011 |
| 101.203.96.0/19 | 8.2k | APNIC | JP | 7th Mar 2011 |
| 101.208.0.0/12 | 1M | APNIC | IN | 14th Jan 2011 |
| 101.234.64.0/21 | 2k | APNIC | CN | 12th Apr 2011 |