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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.

Unannounced blocks in United States

27,001 blocks match, ordered by prefix.

Allocated but unannounced blocks, 23551 to 23600 of 27001
Prefix	Addresses	Registry	Country	Allocated
2607:f138::/32	4.3B × /64	ARIN	US	11th Sept 2007
2607:f158::/32	4.3B × /64	ARIN	US	25th Sept 2007
2607:f168::/32	4.3B × /64	ARIN	US	26th Sept 2007
2607:f198::/32	4.3B × /64	ARIN	US	11th Oct 2007
2607:f1a0::/32	4.3B × /64	ARIN	US	11th Oct 2007
2607:f1b0::/32	4.3B × /64	ARIN	US	17th Oct 2007
2607:f1e8::/32	4.3B × /64	ARIN	US	25th Oct 2007
2607:f200::/32	4.3B × /64	ARIN	US	31st Oct 2007
2607:f240::/32	4.3B × /64	ARIN	US	14th Nov 2007
2607:f260::/32	4.3B × /64	ARIN	US	3rd Dec 2007
2607:f288::/32	4.3B × /64	ARIN	US	14th Dec 2007
2607:f2a8::/32	4.3B × /64	ARIN	US	4th Jan 2008
2607:f2b0::/32	4.3B × /64	ARIN	US	8th Jan 2008
2607:f310::/32	4.3B × /64	ARIN	US	7th Feb 2008
2607:f3b8::/32	4.3B × /64	ARIN	US	24th Mar 2008
2607:f40::/32	4.3B × /64	ARIN	US	2nd Dec 2022
2607:f420::/32	4.3B × /64	ARIN	US	26th Jan 2023
2607:f428::/32	4.3B × /64	ARIN	US	9th Apr 2008
2607:f458::/32	4.3B × /64	ARIN	US	25th Apr 2008
2607:f468::/32	4.3B × /64	ARIN	US	1st May 2008
2607:f480::/32	4.3B × /64	ARIN	US	1st May 2008
2607:f488::/32	4.3B × /64	ARIN	US	5th May 2008
2607:f4c8::/32	4.3B × /64	ARIN	US	20th May 2008
2607:f4e8::/32	4.3B × /64	ARIN	US	22nd May 2008
2607:f4f8::/32	4.3B × /64	ARIN	US	2nd Jun 2008
2607:f510::/32	4.3B × /64	ARIN	US	6th Jun 2008
2607:f548::/32	4.3B × /64	ARIN	US	18th Jun 2008
2607:f550::/32	4.3B × /64	ARIN	US	23rd Jun 2008
2607:f568::/32	4.3B × /64	ARIN	US	27th Jun 2008
2607:f5d0::/32	4.3B × /64	ARIN	US	12th Aug 2008
2607:f5f8::/32	4.3B × /64	ARIN	US	20th Aug 2008
2607:f608::/32	4.3B × /64	ARIN	US	22nd Aug 2008
2607:f618::/32	4.3B × /64	ARIN	US	25th Aug 2008
2607:f620::/32	4.3B × /64	ARIN	US	25th Aug 2008
2607:f628::/32	4.3B × /64	ARIN	US	2nd Sept 2008
2607:f630::/32	4.3B × /64	ARIN	US	10th Sept 2008
2607:f638::/32	4.3B × /64	ARIN	US	18th Sept 2008
2607:f650::/32	4.3B × /64	ARIN	US	29th Sept 2008
2607:f660::/32	4.3B × /64	ARIN	US	8th Oct 2008
2607:f680::/32	4.3B × /64	ARIN	US	17th Oct 2008
2607:f688::/32	4.3B × /64	ARIN	US	20th Oct 2008
2607:f6a8::/32	4.3B × /64	ARIN	US	7th Nov 2008
2607:f6c8::/32	4.3B × /64	ARIN	US	17th Nov 2008
2607:f6d8::/32	4.3B × /64	ARIN	US	26th Nov 2008
2607:f6e8::/32	4.3B × /64	ARIN	US	26th Nov 2008
2607:f700::/32	4.3B × /64	ARIN	US	2nd Dec 2008
2607:f728::/32	4.3B × /64	ARIN	US	9th Dec 2008
2607:f760::/32	4.3B × /64	ARIN	US	31st Dec 2008
2607:f788::/32	4.3B × /64	ARIN	US	21st Jan 2009
2607:f7e8::/32	4.3B × /64	ARIN	US	9th Feb 2009