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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 201.4.64.0/20 | 4.1k | RIPE NCC |  PL | 13th Mar 2025 |
| 201.46.122.0/23 | 512 | LACNIC |  BR | 18th Aug 2005 |
| 201.49.148.0/23 | 512 | LACNIC | BR | 22nd Jun 2010 |
| 201.49.150.0/24 | 256 | LACNIC | BR | 22nd Jun 2010 |
| 201.49.151.0/24 | 256 | LACNIC | BR | 22nd Jun 2010 |
| 201.50.128.0/17 | 32.8k | ARIN |  US | 29th Jul 2026 |
| 201.51.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.51.64.0/18 | 16.4k | RIPE NCC |  GB | 6th Mar 2025 |
| 201.58.0.0/18 | 16.4k | RIPE NCC | GB | 6th Mar 2025 |
| 201.58.128.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 201.58.224.0/19 | 8.2k | RIPE NCC |  LT | 13th Mar 2025 |
| 201.58.96.0/19 | 8.2k | RIPE NCC | LT | 13th Mar 2025 |
| 201.7.16.0/20 | 4.1k | RIPE NCC | PL | 13th Mar 2025 |
| 201.71.204.0/22 | 1k | LACNIC |  MX | 27th Feb 2020 |
| 201.78.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.78.224.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.0.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.8.32.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 201.8.64.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 201.87.139.0/24 | 256 | LACNIC | BR | 25th May 2006 |
| 201.87.140.0/23 | 512 | LACNIC | BR | 25th May 2006 |
| 201.87.157.0/24 | 256 | LACNIC | BR | 7th May 2008 |
| 201.89.128.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.9.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 201.94.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 202.0.100.0/23 | 512 | APNIC |  CN | 14th Apr 2011 |
| 202.0.104.0/24 | 256 | APNIC |  SG | 5th Apr 2011 |
| 202.0.120.0/24 | 256 | APNIC |  TH | 12th Aug 1993 |
| 202.0.122.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 202.0.125.0/24 | 256 | APNIC |  NZ | 28th Jul 2010 |
| 202.0.126.0/24 | 256 | APNIC | SG | 8th Oct 1999 |
| 202.0.16.0/20 | 4.1k | APNIC |  PH | 18th Nov 1993 |
| 202.0.184.0/22 | 1k | APNIC |  AU | 18th Apr 2000 |
| 202.0.192.0/18 | 16.4k | APNIC | US | 19th Sept 1994 |
| 202.0.69.0/24 | 256 | APNIC | AU | 21st Apr 1997 |
| 202.0.72.0/24 | 256 | APNIC |  JP | 1st Jul 1997 |
| 202.0.76.0/24 | 256 | APNIC | JP | 21st Jan 1998 |
| 202.0.84.0/24 | 256 | APNIC | NZ | 13th Apr 1994 |
| 202.0.85.0/24 | 256 | APNIC | AU | 1st Jan 1993 |
| 202.0.90.0/24 | 256 | APNIC | AU | 1st Jan 1993 |
| 202.0.91.0/24 | 256 | APNIC | PH | 8th Sept 1999 |
| 202.1.120.0/21 | 2k | APNIC |  IN | 26th Sept 2003 |
| 202.1.237.0/24 | 256 | APNIC | AU | 16th Sept 2009 |
| 202.1.3.0/24 | 256 | APNIC | AU | 16th Mar 1993 |
| 202.1.5.0/24 | 256 | APNIC | SG | 19th Sept 2000 |
| 202.1.8.0/21 | 2k | APNIC | NZ | 4th Oct 1994 |
| 202.10.0.0/22 | 1k | APNIC | AU | 29th Nov 1995 |
| 202.10.112.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 202.10.116.0/22 | 1k | APNIC | CN | 21st Nov 2015 |