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Database

Registry Statistics

Everything on this page is computed from the current registry import and refreshes every time the data updates. Last rebuilt September 12, 2026.

Assignments

58,260

Address blocks on file

Organizations

34,006

Distinct registrants

Countries

118

Represented in filings

Addresses reserved

676.6B

0.24% of the 48 bit space

The five registries

The IEEE sells address space in three sizes, plus two legacy registries. Smaller blocks cost less, which is why the count and the reserved address space rank in opposite orders.

RegistryPrefixAssignmentsShareOrganizationsAddresses
MA-LOUI24 bits39,69668.1%20,094666B
MA-SOUI-3636 bits7,18612.3%5,40429.4M
MA-MOUI-2828 bits6,58411.3%6,0586.9B
IABIAB36 bits4,5757.9%3,87918.7M
CIDCID24 bits2190.4%2143.7B

Most address blocks

Counting assignments, regardless of how large each one is.

  1. 1Apple, Inc.1,553
  2. 2HUAWEI TECHNOLOGIES CO.,LTD1,407
  3. 3Cisco Systems, Inc1,251
  4. 4Samsung Electronics Co.,Ltd906
  5. 5Intel Corporate667
  6. 6Huawei Device Co., Ltd.660
  7. 7zte corporation499
  8. 8Texas Instruments401
  9. 9Commscope345
  10. 10Espressif Inc.339

Most addresses reserved

Counting individual MAC addresses. One 24 bit block outweighs 4,096 of the smallest size.

  1. 1Apple, Inc.26.1B
  2. 2HUAWEI TECHNOLOGIES CO.,LTD23.6B
  3. 3Cisco Systems, Inc21B
  4. 4Samsung Electronics Co.,Ltd15.2B
  5. 5Intel Corporate11.2B
  6. 6Huawei Device Co., Ltd.11.1B
  7. 7zte corporation8.4B
  8. 8Texas Instruments6.7B
  9. 9Commscope5.8B
  10. 10Espressif Inc.5.7B

Where registrants are based

By blocks filed from each country.

  1. 🇺🇸 United States16,981
  2. 🇨🇳 China12,669
  3. 🇰🇷 South Korea3,482
  4. 🇩🇪 Germany2,945
  5. 🇹🇼 Taiwan2,915
  6. 🇯🇵 Japan2,550
  7. 🇬🇧 United Kingdom1,615
  8. 🇫🇷 France1,230
  9. 🇨🇦 Canada1,225
  10. 🇮🇹 Italy1,102
  11. 🇲🇾 Malaysia822
  12. 🇮🇳 India734
  13. 🇨🇭 Switzerland709
  14. 🇮🇱 Israel655
  15. 🇭🇰 Hong Kong SAR China632

How much vendors hold

The registry is a long tail: most organizations bought exactly one block and never came back.

  1. 1 block30,776
  2. 2 to 52,707
  3. 6 to 20360
  4. 21 to 100132
  5. over 10031

Odds and ends

One block only

30,776

91% of all registrants

Median per vendor

1

Blocks held by the typical organization

Filed as Private

237

Registrant withheld its name

Multi registry

1,554

Hold blocks of more than one size

Busiest parent prefixes

Small blocks are carved out of 24 bit prefixes. A handful of those prefixes act as shared pools and hold thousands of sub-assignments each, which is why a lookup has to match the longest prefix rather than the first one it finds.

PrefixParent registrantSub-assignments
70:B3:D5IEEE Registration Authority4,092
00:50:C2Unassigned parent prefix4,088
8C:1F:64Unassigned parent prefix2,893
40:D8:55Unassigned parent prefix487
00:1B:C5Unassigned parent prefix201
00:55:DAUnassigned parent prefix16
0C:EF:AFUnassigned parent prefix16
14:1F:BAUnassigned parent prefix16

How much space is left

A MAC address is 48 bits, which is roughly 281 trillion addresses. Half of that is unavailable straight away: the multicast bit and the locally administered bit each halve the usable space, leaving about 70 trillion universally administered unicast addresses. The 58,260 assignments on file reserve 676,614,574,080 of them, or 0.24% of the whole 48 bit space.

At the current rate the IEEE is in no danger of running out, which is the main reason the smaller MA-M and MA-S sizes exist: they let the registry sell to companies that would otherwise waste 16.7 million addresses on a product line of a few thousand units.