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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

Unannounced blocks in United States

26,283 blocks match, ordered by prefix.

Allocated but unannounced blocks, 22601 to 22650 of 26283
Prefix	Addresses	Registry	Country	Allocated
2606:5180::/32	4.3B × /64	ARIN	US	8th May 2026
2606:51c0::/32	4.3B × /64	ARIN	US	21st May 2021
2606:5280::/32	4.3B × /64	ARIN	US	17th Jul 2015
2606:52c0::/32	4.3B × /64	ARIN	US	21st May 2021
2606:5380::/32	4.3B × /64	ARIN	US	20th Jul 2015
2606:53c0::/32	4.3B × /64	ARIN	US	24th May 2021
2606:5400::/32	4.3B × /64	ARIN	US	9th Sept 2010
2606:540::/32	4.3B × /64	ARIN	US	29th Oct 2020
2606:5580::/32	4.3B × /64	ARIN	US	21st Jul 2015
2606:5640::/32	4.3B × /64	ARIN	US	3rd Jun 2021
2606:5740::/32	4.3B × /64	ARIN	US	3rd Jun 2021
2606:5800::/32	4.3B × /64	ARIN	US	20th May 2010
2606:580::/32	4.3B × /64	ARIN	US	5th Mar 2015
2606:5840::/32	4.3B × /64	ARIN	US	9th Jun 2021
2606:59c0::/32	4.3B × /64	ARIN	US	15th Jun 2021
2606:5a80::/32	4.3B × /64	ARIN	US	22nd Jul 2015
2606:5c00::/32	4.3B × /64	ARIN	US	10th Sept 2010
2606:5c0::/32	4.3B × /64	ARIN	US	29th Oct 2020
2606:5c40::/32	4.3B × /64	ARIN	US	25th Jun 2021
2606:5d40::/32	4.3B × /64	ARIN	US	29th Jun 2021
2606:5ec0::/32	4.3B × /64	ARIN	US	2nd Jul 2021
2606:5f40::/32	4.3B × /64	ARIN	US	8th Jul 2021
2606:61c0::/32	4.3B × /64	ARIN	US	12th Jul 2021
2606:62c0::/32	4.3B × /64	ARIN	US	13th Jul 2021
2606:6340::/32	4.3B × /64	ARIN	US	14th May 2026
2606:6400::/32	4.3B × /64	ARIN	US	13th Sept 2010
2606:6540::/32	4.3B × /64	ARIN	US	21st Jul 2021
2606:6600::/32	4.3B × /64	ARIN	US	8th Feb 2011
2606:6640::/32	4.3B × /64	ARIN	US	18th May 2026
2606:66c0::/32	4.3B × /64	ARIN	US	28th Jul 2021
2606:6700::/32	4.3B × /64	ARIN	US	14th Nov 2011
2606:6840::/32	4.3B × /64	ARIN	US	6th Aug 2021
2606:6940::/32	4.3B × /64	ARIN	US	9th Aug 2021
2606:6980::/32	4.3B × /64	ARIN	US	19th Aug 2015
2606:6b00::/32	4.3B × /64	ARIN	US	15th Nov 2011
2606:6b80::/32	4.3B × /64	ARIN	US	24th Aug 2015
2606:6bc0::/32	4.3B × /64	ARIN	US	11th Aug 2021
2606:6c40::/32	4.3B × /64	ARIN	US	16th Aug 2021
2606:6cc0::/32	4.3B × /64	ARIN	US	16th Aug 2021
2606:6d40::/32	4.3B × /64	ARIN	US	16th Aug 2021
2606:6e40::/32	4.3B × /64	ARIN	US	18th Aug 2021
2606:6f00::/32	4.3B × /64	ARIN	US	18th Nov 2011
2606:6f40::/32	4.3B × /64	ARIN	US	19th Aug 2021
2606:6fc0::/32	4.3B × /64	ARIN	US	19th Aug 2021
2606:71c0::/32	4.3B × /64	ARIN	US	24th Aug 2021
2606:7300::/32	4.3B × /64	ARIN	US	23rd Nov 2011
2606:7400::/32	4.3B × /64	ARIN	US	14th Sept 2010
2606:7500::/32	4.3B × /64	ARIN	US	23rd Nov 2011
2606:7580::/32	4.3B × /64	ARIN	US	1st Sept 2015
2606:7600::/32	4.3B × /64	ARIN	US	8th Feb 2011