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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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, 22951 to 23000 of 26283
Prefix	Addresses	Registry	Country	Allocated
2607:5280::/32	4.3B × /64	ARIN	US	27th May 2016
2607:5400::/32	4.3B × /64	ARIN	US	4th Oct 2010
2607:540::/32	4.3B × /64	ARIN	US	9th Nov 2022
2607:55c0::/32	4.3B × /64	ARIN	US	28th Jun 2023
2607:5680::/32	4.3B × /64	ARIN	US	2nd Jun 2016
2607:5700::/32	4.3B × /64	ARIN	US	20th Apr 2012
2607:5740::/32	4.3B × /64	ARIN	US	7th Jul 2023
2607:57c0::/32	4.3B × /64	ARIN	US	7th Jul 2023
2607:58c0::/32	4.3B × /64	ARIN	US	12th Jul 2023
2607:59c0::/32	4.3B × /64	ARIN	US	13th Jul 2023
2607:5a00::/32	4.3B × /64	ARIN	US	1st Mar 2011
2607:5a40::/32	4.3B × /64	ARIN	US	14th Jul 2023
2607:5b00::/32	4.3B × /64	ARIN	US	23rd Jan 2014
2607:5c00::/32	4.3B × /64	ARIN	US	4th Oct 2010
2607:5cc0::/32	4.3B × /64	ARIN	US	24th Jul 2023
2607:5ec0::/32	4.3B × /64	ARIN	US	31st Jul 2023
2607:5f00::/32	4.3B × /64	ARIN	US	25th Apr 2012
2607:5f80::/32	4.3B × /64	ARIN	US	14th Jun 2016
2607:5fc0::/32	4.3B × /64	ARIN	US	2nd Aug 2023
2607:600::/32	4.3B × /64	ARIN	US	18th Feb 2011
2607:6140::/32	4.3B × /64	ARIN	US	7th Aug 2023
2607:6200::/32	4.3B × /64	ARIN	US	2nd Mar 2011
2607:6340::/32	4.3B × /64	ARIN	US	18th Aug 2023
2607:640::/32	4.3B × /64	ARIN	US	10th Nov 2022
2607:6440::/28	68.7B × /64	ARIN	US	25th Aug 2023
2607:6580::/32	4.3B × /64	ARIN	US	29th Jun 2016
2607:65c0::/32	4.3B × /64	ARIN	US	29th Aug 2023
2607:6600::/32	4.3B × /64	ARIN	US	2nd Mar 2011
2607:6640::/32	4.3B × /64	ARIN	US	31st Aug 2023
2607:6700::/32	4.3B × /64	ARIN	US	8th May 2012
2607:6740::/32	4.3B × /64	ARIN	US	5th Sept 2023
2607:67c0::/32	4.3B × /64	ARIN	US	6th Sept 2023
2607:6840::/32	4.3B × /64	ARIN	US	7th Sept 2023
2607:6940::/32	4.3B × /64	ARIN	US	8th Sept 2023
2607:6a00::/32	4.3B × /64	ARIN	US	3rd Mar 2011
2607:6a80::/32	4.3B × /64	ARIN	US	7th Jul 2016
2607:6b00::/32	4.3B × /64	ARIN	US	10th May 2012
2607:6c0::/32	4.3B × /64	ARIN	US	14th Nov 2022
2607:6cc0::/32	4.3B × /64	ARIN	US	19th Sept 2023
2607:6d80::/32	4.3B × /64	ARIN	US	12th Jul 2016
2607:6dc0::/32	4.3B × /64	ARIN	US	25th Sept 2023
2607:6e00::/32	4.3B × /64	ARIN	US	3rd Mar 2011
2607:7080::/32	4.3B × /64	ARIN	US	14th Jul 2016
2607:7100::/32	4.3B × /64	ARIN	US	15th May 2012
2607:7280::/32	4.3B × /64	ARIN	US	19th Jul 2016
2607:7380::/32	4.3B × /64	ARIN	US	10th Jun 2026
2607:7400::/32	4.3B × /64	ARIN	US	7th Oct 2010
2607:7440::/32	4.3B × /64	ARIN	US	16th Oct 2023
2607:7480::/32	4.3B × /64	ARIN	US	22nd Jul 2016
2607:7500::/32	4.3B × /64	ARIN	US	16th May 2012