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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

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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, 23101 to 23150 of 27001
Prefix	Addresses	Registry	Country	Allocated
2606:bc00::/32	4.3B × /64	ARIN	US	20th Sept 2010
2606:bc40::/32	4.3B × /64	ARIN	US	4th Mar 2022
2606:bc80::/32	4.3B × /64	ARIN	US	20th Nov 2015
2606:bcc0::/32	4.3B × /64	ARIN	US	4th Mar 2022
2606:bd40::/32	4.3B × /64	ARIN	US	4th Mar 2022
2606:bdc0::/32	4.3B × /64	ARIN	US	7th Mar 2022
2606:be40::/32	4.3B × /64	ARIN	US	8th Mar 2022
2606:bf80::/32	4.3B × /64	ARIN	US	1st Dec 2015
2606:bfc0::/32	4.3B × /64	ARIN	US	8th Mar 2022
2606:c100::/32	4.3B × /64	ARIN	US	9th Jan 2012
2606:c180::/32	4.3B × /64	ARIN	US	2nd Dec 2015
2606:c1c0::/32	4.3B × /64	ARIN	US	16th Mar 2022
2606:c1f0::/32	4.3B × /64	ARIN	US	10th Jul 2026
2606:c300::/32	4.3B × /64	ARIN	US	10th Jan 2012
2606:c3c0::/32	4.3B × /64	ARIN	US	30th Mar 2022
2606:c400::/32	4.3B × /64	ARIN	US	21st May 2026
2606:c540::/32	4.3B × /64	ARIN	US	4th Apr 2022
2606:c580::/32	4.3B × /64	ARIN	US	4th Dec 2015
2606:c5c0::/32	4.3B × /64	ARIN	US	4th Apr 2022
2606:c600::/32	4.3B × /64	ARIN	US	27th May 2026
2606:c780::/32	4.3B × /64	ARIN	US	7th Dec 2015
2606:c80::/32	4.3B × /64	ARIN	US	16th Apr 2026
2606:c840::/32	4.3B × /64	ARIN	US	13th Apr 2022
2606:c940::/28	68.7B × /64	ARIN	US	13th Apr 2022
2606:c980::/32	4.3B × /64	ARIN	US	8th Dec 2015
2606:ca80::/32	4.3B × /64	ARIN	US	8th Dec 2015
2606:cb00::/32	4.3B × /64	ARIN	US	13th Jan 2012
2606:cc40::/32	4.3B × /64	ARIN	US	20th Apr 2022
2606:cc80::/32	4.3B × /64	ARIN	US	10th Dec 2015
2606:cd00::/32	4.3B × /64	ARIN	US	17th Jan 2012
2606:cde0::/32	4.3B × /64	ARIN	US	21st Jul 2026
2606:cf40::/32	4.3B × /64	ARIN	US	4th May 2022
2606:d000::/32	4.3B × /64	ARIN	US	2nd Apr 2010
2606:d00::/32	4.3B × /64	ARIN	US	26th Sept 2011
2606:d080::/32	4.3B × /64	ARIN	US	16th Dec 2015
2606:d0c0::/36	268M × /64	ARIN	US	5th May 2022
2606:d100::/32	4.3B × /64	ARIN	US	19th Jan 2012
2606:d140::/32	4.3B × /64	ARIN	US	5th May 2022
2606:d2c0::/32	4.3B × /64	ARIN	US	11th May 2022
2606:d300::/36	268M × /64	ARIN	US	19th Jan 2012
2606:d340::/32	4.3B × /64	ARIN	US	16th May 2022
2606:d3c0::/32	4.3B × /64	ARIN	US	20th May 2022
2606:d400::/32	4.3B × /64	ARIN	US	22nd Sept 2010
2606:d480::/32	4.3B × /64	ARIN	US	18th Dec 2015
2606:d540::/32	4.3B × /64	ARIN	US	24th May 2022
2606:d580::/32	4.3B × /64	ARIN	US	18th Dec 2015
2606:d600::/32	4.3B × /64	ARIN	US	16th Feb 2011
2606:d640::/32	4.3B × /64	ARIN	US	26th May 2022
2606:d740::/32	4.3B × /64	ARIN	US	31st May 2022
2606:d780::/32	4.3B × /64	ARIN	US	22nd Dec 2015