IPv4 Transfers May 2021

In May 2021, the five Regional Internet Registries recorded 926 transfers: 7,728,768 IPv4 addresses in 706 blocks, plus 108 IPv6 blocks and 112 AS numbers. 50 transfers moved resources between two registries. Dates are the dates the registry processed the transfer.

IPv4 addresses transferred
7.7M
706 IPv4 blocks
Registry transfers
926
108 IPv6 / 112 ASN
Inter-RIR transfers
50
279K IPv4 addresses (4%)
Mergers and acquisitions
335
591 market transfers

Transfer Volume by RIR

Transfers counted at the receiving registry. Inter-RIR columns show IPv4 that entered or left the region.

Transfers per Regional Internet Registry, May 2021
RegistryTransfersIPv4 receivedInter-RIR inInter-RIR out
ARIN2596,260,99252,992132,352
RIPE NCC6371,012,608135,680120,320
APNIC28422,14490,62426,624
LACNIC233,024--

Inter-RIR Transfers May 2021

IPv4 addresses moved from one registry to another. All inter-RIR transfers

IPv4 addresses transferred between Regional Internet Registries
From ↓ / To →RIPE NCCARINAPNICLACNICAFRINIC
RIPE NCC-
38K
8 transfers
82K
5 transfers
00
ARIN
124K
17 transfers
-
8,192
2 transfers
00
APNIC
12K
7 transfers
15K
11 transfers
-00
LACNIC000-0
AFRINIC0000-

IPv4 Transfers by Block Size

Number of transferred IPv4 blocks per prefix length.

IPv4 transfers by prefix length, May 2021
Prefix lengthAddresses per blockBlocksShare of blocksIPv4 addresses
/112,097,15210.1%2,097,152
/14262,14440.6%1,048,576
/15131,07260.8%786,432
/1665,536334.7%2,162,688
/1732,768111.6%360,448
/1816,384202.8%327,680
/198,192284.0%229,376
/204,096618.6%249,856
/212,048669.3%135,168
/221,02424935.3%254,976
/235127210.2%36,864
/2425615421.8%39,424
/2512810.1%128

Top Receiving Countries

  1. 1🇹🇭 Thailand33K
  2. 2🇨🇳 China33K
  3. 3🇨🇦 Canada18K
  4. 4🇭🇰 Hong Kong SAR China16K
  5. 5🇺🇸 United States16K
  6. 6🇦🇺 Australia6,144
  7. 7🇳🇵 Nepal4,096
  8. 8🇻🇬 British Virgin Islands4,096
  9. 9🇲🇾 Malaysia1,024

Top Source Countries

  1. 1🇺🇸 United States31K
  2. 2🇦🇺 Australia9,216
  3. 3🇲🇳 Mongolia8,192
  4. 4🇯🇵 Japan6,912
  5. 5🇧🇩 Bangladesh2,560
  6. 6🇨🇦 Canada1,024
  7. 7🇭🇰 Hong Kong SAR China1,024
  8. 8🇫🇯 Fiji1,024
  9. 9🇮🇩 Indonesia1,024

IPv4 transferred across country borders in May 2021. Registry logs before mid-2025 do not carry a country for every transfer, so this ranking undercounts some regions.

Largest IPv4 Transfers May 2021