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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

Unannounced blocks registered through ARIN

30,434 blocks match, ordered by prefix.

Allocated but unannounced blocks, 27001 to 27050 of 30434
Prefix	Addresses	Registry	Country	Allocated
2607:c600::/32	4.3B × /64	ARIN	US	15th Mar 2011
2607:c700::/32	4.3B × /64	ARIN	US	2nd Jul 2012
2607:c740::/32	4.3B × /64	ARIN	PR	19th Jul 2024
2607:c780::/32	4.3B × /64	ARIN	US	10th Nov 2016
2607:c7c0::/32	4.3B × /64	ARIN	US	22nd Jul 2024
2607:c800::/32	4.3B × /64	ARIN	US	10th Jun 2010
2607:c900::/32	4.3B × /64	ARIN	US	30th Jun 2026
2607:cac0::/32	4.3B × /64	ARIN	US	6th Aug 2024
2607:cb00::/32	4.3B × /64	ARIN	US	9th Jul 2012
2607:cbc0::/32	4.3B × /64	ARIN	US	8th Aug 2024
2607:ccc0::/32	4.3B × /64	ARIN	CA	9th Aug 2024
2607:cd00::/32	4.3B × /64	ARIN	US	9th Jul 2012
2607:ce00::/32	4.3B × /64	ARIN	US	15th Mar 2011
2607:ce40::/32	4.3B × /64	ARIN	US	22nd Aug 2024
2607:cec0::/32	4.3B × /64	ARIN	US	23rd Aug 2024
2607:cfc0::/32	4.3B × /64	ARIN	US	28th Aug 2024
2607:d080::/32	4.3B × /64	ARIN	US	16th Nov 2016
2607:d100::/32	4.3B × /64	ARIN	US	27th Nov 2012
2607:d140::/32	4.3B × /64	ARIN	US	30th Aug 2024
2607:d180::/32	4.3B × /64	ARIN	US	18th Nov 2016
2607:d200::/32	4.3B × /64	ARIN	US	15th Mar 2011
2607:d280::/32	4.3B × /64	ARIN	US	21st Nov 2016
2607:d2c0::/32	4.3B × /64	ARIN	US	4th Sept 2024
2607:d340::/32	4.3B × /64	ARIN	US	4th Sept 2024
2607:d380::/32	4.3B × /64	ARIN	CA	22nd Nov 2016
2607:d480::/32	4.3B × /64	ARIN	US	22nd Nov 2016
2607:d680::/32	4.3B × /64	ARIN	US	23rd Nov 2016
2607:d6c0::/32	4.3B × /64	ARIN	US	20th Sept 2024
2607:d700::/32	4.3B × /64	ARIN	CA	17th Jul 2012
2607:d780::/32	4.3B × /64	ARIN	US	28th Nov 2016
2607:d880::/32	4.3B × /64	ARIN	CA	30th Nov 2016
2607:d8c0::/32	4.3B × /64	ARIN	US	1st Oct 2024
2607:d900::/32	4.3B × /64	ARIN	US	19th Jul 2012
2607:d940::/32	4.3B × /64	ARIN	US	4th Oct 2024
2607:d9c0::/32	4.3B × /64	ARIN	US	4th Oct 2024
2607:da40::/32	4.3B × /64	ARIN	US	9th Oct 2024
2607:dac0::/32	4.3B × /64	ARIN	US	10th Oct 2024
2607:dc00::/32	4.3B × /64	ARIN	US	19th Oct 2010
2607:dcc0::/36	268M × /64	ARIN	US	17th Oct 2024
2607:dd00::/32	4.3B × /64	ARIN	US	23rd Jul 2012
2607:de00::/32	4.3B × /64	ARIN	CA	15th Mar 2011
2607:de40::/32	4.3B × /64	ARIN	US	24th Oct 2024
2607:de80::/32	4.3B × /64	ARIN	CZ	2nd Dec 2016
2607:df00::/32	4.3B × /64	ARIN	US	23rd Jul 2012
2607:df40::/32	4.3B × /64	ARIN	US	30th Oct 2024
2607:e040::/32	4.3B × /64	ARIN	US	4th Nov 2024
2607:e140::/32	4.3B × /64	ARIN	CA	5th Nov 2024
2607:e200::/32	4.3B × /64	ARIN	US	16th Mar 2011
2607:e240::/40	16.8M × /64	ARIN	CA	15th Nov 2024
2607:e340::/32	4.3B × /64	ARIN	CA	25th Nov 2024