IPv4 Transfers 2021

In 2021, the five Regional Internet Registries recorded 14,911 transfers that moved 99,549,216 IPv4 addresses in 11,722 blocks, 640 of them between two registries. Figures come from the RIRs' official transfer logs and include mergers and acquisitions.

IPv4 addresses transferred
99.5M
11,722 IPv4 blocks
Registry transfers
14,911
1,522 IPv6 / 1,667 ASN
Inter-RIR transfers
640
3.2M IPv4 addresses (3%)
Mergers and acquisitions
4,847
10,064 market transfers

Monthly Transfer Volume 2021 by receiving RIR

IPv4 transfers per month in 2021
MonthTransfersIPv4 addresses
December 20211,8536,742,528
November 20211,67231,860,608
October 20211,0973,137,600
September 20211,2335,442,304
August 20219134,766,976
July 20211,0775,837,664
June 20219854,533,248
May 20219267,728,768
April 20211,1114,823,424
March 20211,4309,638,656
February 20211,7914,255,744
January 202182310,781,696

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, 2021
RegistryTransfersIPv4 receivedInter-RIR inInter-RIR out
ARIN4,28867,252,224243,4562,264,064
RIPE NCC9,49521,327,3922,329,088396,288
APNIC9297,314,432625,152316,160
AFRINIC1143,447,552--
LACNIC85207,61627,648248,832

Inter-RIR Transfers 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-
153K
97 transfers
239K
41 transfers
4,352
4 transfers
0
ARIN
1.9M
174 transfers
-
370K
59 transfers
23K
9 transfers
0
APNIC
251K
171 transfers
65K
59 transfers
-00
LACNIC
207K
15 transfers
25K
10 transfers
16K
1 transfers
-0
AFRINIC0000-

IPv4 Transfers by Block Size

Number of transferred IPv4 blocks per prefix length.

IPv4 transfers by prefix length, 2021
Prefix lengthAddresses per blockBlocksShare of blocksIPv4 addresses
/98,388,60810.0%8,388,608
/104,194,30440.0%16,777,216
/112,097,15230.0%6,291,456
/121,048,57630.0%3,145,728
/13524,28890.1%4,718,592
/14262,144250.2%6,553,600
/15131,072380.3%4,980,736
/1665,5363923.3%25,690,112
/1732,7681321.1%4,325,376
/1816,3842402.0%3,932,160
/198,1925644.8%4,620,288
/204,0967346.3%3,006,464
/212,0487676.5%1,570,816
/221,0243,85932.9%3,951,616
/235121,29011.0%660,480
/242563,65431.2%935,424
/2512830.0%384
/266410.0%64
/273230.0%96

Top Receiving Countries

  1. 1🇸🇬 Singapore1.4M
  2. 2🇨🇳 China728K
  3. 3🇺🇸 United States444K
  4. 4🇨🇦 Canada354K
  5. 5🇯🇵 Japan217K
  6. 6🇫🇷 France188K
  7. 7🇵🇭 Philippines143K
  8. 8🇭🇰 Hong Kong SAR China133K
  9. 9🇮🇱 Israel82K

Top Source Countries

  1. 1🇦🇺 Australia2.3M
  2. 2🇨🇳 China1.2M
  3. 3🇺🇸 United States724K
  4. 4🇸🇬 Singapore550K
  5. 5🇨🇦 Canada370K
  6. 6🇧🇷 Brazil209K
  7. 7🇮🇳 India82K
  8. 8🇿🇦 South Africa79K
  9. 9🇭🇰 Hong Kong SAR China70K

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

Largest IPv4 Transfers 2021