One of the wonderful things about ARIN is that they provide so much data. Here, from their list of specified transfers is a list of all transfers effected through ARIN, to date.
| IPv4 Block | Transfer Date | Buyer | Seller | #Addresses |
| 204.16.240.0/21 | Oct-09 | TeraSwitch | Nortel | 2,048 |
| 216.243.96.0/20 | Nov-09 | Lobo Internet Services | 4,096 | |
| 198.32.100.0/22 | Dec-09 | Equinix | EP.net | 1,024 |
| 198.32.104.0/21 | Dec-09 | Equinix | EP.net | 2,048 |
| 198.32.112.0/21 | Dec-09 | Equinix | EP.net | 2,048 |
| 198.32.120.0/22 | Dec-09 | Equinix | EP.net | 1,024 |
| 198.32.124.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.128.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.129.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.133.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.134.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.175.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.176.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.181.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.182.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.190.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.192.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.241.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 198.32.242.0/23 | Dec-09 | Equinix | EP.net | 512 |
| 198.32.99.0/24 | Dec-09 | Equinix | EP.net | 256 |
| 66.128.0.0/20 | Jun-10 | Xchange Telecom | 4,096 | |
| 69.164.128.0/20 | Jun-10 | Xchange Telecom | 4,096 | |
| 198.32.195.0/24 | Jan-11 | OHSU | EP.net | 256 |
| 198.32.196.0/24 | Jan-11 | OHSU | EP.net | 256 |
| 130.167.0.0/16 | Feb-11 | Space Telescop | 65,536 | |
| 198.32.144.0/24 | Feb-11 | Datagram | EP.net | 256 |
| 199.7.82.0/24 | Feb-11 | L-Root | Nortel | 256 |
| 198.32.132.0/24 | May-11 | Telx | EP.net | 256 |
| 198.32.186.0/24 | May-11 | Telx | EP.net | 256 |
| 216.139.64.0/19 | Jun-11 | Aldridge | 8,192 | |
| 131.253.1.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.12.0/22 | Aug-11 | Microsoft | Nortel | 1,024 |
| 131.253.128.0/17 | Aug-11 | Microsoft | Nortel | 32,768 |
| 131.253.16.0/23 | Aug-11 | Microsoft | Nortel | 512 |
| 131.253.18.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.21.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.22.0/23 | Aug-11 | Microsoft | Nortel | 512 |
| 131.253.24.0/21 | Aug-11 | Microsoft | Nortel | 2,048 |
| 131.253.3.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.32.0/20 | Aug-11 | Microsoft | Nortel | 4,096 |
| 131.253.5.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.6.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.61.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 131.253.62.0/23 | Aug-11 | Microsoft | Nortel | 512 |
| 131.253.64.0/18 | Aug-11 | Microsoft | Nortel | 16,384 |
| 131.253.8.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 132.245.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 134.170.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 134.177.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 137.116.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 137.117.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 137.135.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 138.91.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 141.251.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 192.32.0.0/16 | Aug-11 | Microsoft | Nortel | 65,536 |
| 192.48.225.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 192.84.159.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 192.84.160.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 192.84.161.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 198.200.130.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 198.206.164.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 198.49.8.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 199.242.32.0/20 | Aug-11 | Microsoft | Nortel | 4,096 |
| 199.242.48.0/21 | Aug-11 | Microsoft | Nortel | 2,048 |
| 199.30.16.0/20 | Aug-11 | Microsoft | Nortel | 4,096 |
| 199.74.210.0/24 | Aug-11 | Microsoft | Nortel | 256 |
| 204.152.140.0/23 | Aug-11 | Microsoft | Nortel | 512 |
| 205.174.224.0/20 | Aug-11 | Microsoft | Nortel | 4,096 |
| 67.215.108.0/22 | Aug-11 | Open Mobile | 1,024 | |
| 69.55.32.0/20 | Aug-11 | Reservation Telephone | 4,096 | |
| 160.153.0.0/16 | Sep-11 | GoDaddy | 65,536 | |
| 216.71.224.0/20 | Oct-11 | Reservation Telephone | 4,096 | |
| 174.44.0.0/16 | Dec-11 | Optimum | 65,536 | |
| 208.83.128.0/22 | Dec-11 | Meddius | 1,024 | |
| 54.240.0.0/12 | Dec-11 | Amazon | Merck | 1,048,576 |
| 128.136.0.0/16 | Feb-12 | Peak 10 | 65,536 | |
| 136.146.0.0/16 | Feb-12 | Salesforce.com | 65,536 | |
| 136.147.0.0/16 | Feb-12 | Salesforce.com | 65,536 | |
| 165.225.128.0/18 | Feb-12 | Joyent | 16,384 | |
| 170.71.0.0/16 | Feb-12 | Cerner | 65,536 | |
| 47.16.0.0/14 | Feb-12 | Optimum | Nortel | 262,144 |
| 47.20.0.0/14 | Feb-12 | Optimum | Nortel | 262,144 |
| 64.72.208.0/20 | Feb-12 | American Fiber | 4,096 | |
| 208.67.120.0/21 | Mar-12 | DBS | 2,048 | |
| 54.224.0.0/12 | Mar-12 | Amazon | Merck | 1,048,576 |
| 65.22.0.0/16 | Mar-12 | Afilias | 65,536 | |
| 199.254.238.0/24 | Apr-12 | Riseup Networks | Nortel | 256 |
| 47.54.0.0/15 | Apr-12 | Bell Aliant | Nortel | 131,072 |
| 131.150.144.0/20 | May-12 | Vodaphone | Nortel | 4,096 |
| 47.53.0.0/16 | May-12 | Vodaphone | Nortel | 65,536 |
| 47.58.0.0/15 | May-12 | Vodaphone | Nortel | 131,072 |
| 47.60.0.0/14 | May-12 | Vodaphone | Nortel | 262,144 |
| 47.64.0.0/13 | May-12 | Vodaphone | Nortel | 524,288 |
| 47.72.0.0/15 | May-12 | Vodaphone | Nortel | 131,072 |
| 199.15.232.0/21 | Jul-12 | IPStrada | Nortel | 2,048 |
| 158.106.64.0/18 | Aug-12 | Cogeco | 16,384 | |
| 35.248.0.0/13 | Aug-12 | tw telecom | 524,288 | |
| 136.179.0.0/16 | Sep-12 | Switch | 65,536 | |
| 157.250.0.0/18 | Sep-12 | Outscale | 16,384 | |
| 206.190.128.0/19 | Nov-12 | Hosting Services, Inc. | 8,192 | |
| 209.95.32.0/19 | Nov-12 | Hosting Services, Inc. | 8,192 | |
| 40.128.0.0/12 | Nov-12 | Windstream | 1,048,576 | |
| 159.118.0.0/16 | Jan-13 | Cable One | 65,536 | |
| 209.71.128.0/19 | Jan-13 | Information Logistics | 8,192 | |
| 192.64.205.0/24 | Feb-13 | Hara Partners | Nortel | 256 |
| 198.32.224.0/20 | Feb-13 | Rice University | EP.net | 4,096 |
| 54.208.0.0/13 | Feb-13 | Amazon | Merck | 524,288 |
| 54.216.0.0/14 | Feb-13 | Amazon | Merck | 262,144 |
| 54.220.0.0/15 | Feb-13 | Amazon | Merck | 131,072 |
| 198.182.216.0/22 | Mar-13 | RA NAP | Nortel | 1,024 |
| 198.32.0.0/21 | Mar-13 | RA NAP | EP.net | 2,048 |
| 74.118.84.0/22 | May-13 | Lithium Technologies | 1,024 | |
| 173.247.96.0/19 | Jun-13 | Blue Box Group | 8,192 | |
| 54.192.0.0/12 | Jun-13 | Amazon | Merck | 1,048,576 |
| 70.34.224.0/20 | Jun-13 | West Canaan IT | 4,096 | |
| 143.192.128.0/17 | Oct-13 | Telx | 32,768 | |
| 167.89.0.0/17 | Oct-13 | SendGrid | 32,768 | |
| 64.96.0.0/15 | Oct-13 | Uniregistry | 131,072 |
I’ve included the organization who originally held the addresses (“seller”) where I was reasonably confident. I assume that all of these transfers are buyers and sellers, but it is likely that at least some of them were acquired through mergers and acquisitions, but chose to use ARIN’s specified transfer process rather than the M&A transfer process.
Note that this only includes in-region transfers; there have been a number of transfers to recipients in the APNIC region, too:
| IPv4 Address Range | Region of Recipient | Effective Date | Buyer | #Addresses |
| 205.166.177.0/24 | APNIC | Oct-12 | Campaign Monitor | 256 |
| 198.180.142.0/24 | APNIC | Dec-12 | Clara Online | 256 |
| 199.43.18.0/23 | APNIC | Dec-12 | Bank of America | 512 |
| 199.43.45.0/24 | APNIC | Dec-12 | Bank of America | 256 |
| 199.43.63.0/24 | APNIC | Dec-12 | Bank of America | 256 |
| 204.75.142.0/24 | APNIC | Dec-12 | Campaign Monitor | 256 |
| 157.250.64.0/18 | APNIC | Jan-13 | Green Net | 16,384 |
| 132.147.64.0/18 | APNIC | Jan-13 | Viewqwest | 16,384 |
| 54.222.0.0/15 | APNIC | Apr-13 | Amazon | 131,072 |
| 157.250.128.0/17 | APNIC | Apr-13 | Hayabusa | 32,768 |
| 199.166.36.0/23 | APNIC | Apr-13 | Octane Marketing | 512 |
| 162.56.0.0/16 | APNIC | May-13 | Bank of America | 65,536 |
| 165.42.0.0/15 | APNIC | May-13 | Bank of America | 131,072 |
| 205.147.104.0/22 | APNIC | May-13 | Host Virtual | 1,024 |
| 206.131.192.0/20 | APNIC | Jun-13 | Total Synergy IT | 4,096 |
| 136.185.0.0/16 | APNIC | Jun-13 | Telewings | 65,536 |
| 205.147.108.0/22 | APNIC | Jul-13 | E2E Networks | 1,024 |
| 199.166.34.0/23 | APNIC | Sep-13 | Octane Marketing | 512 |
| 174.138.144.0/20 | APNIC | Nov-13 | SunnyVision | 4,096 |
| 216.151.192.0/20 | APNIC | Nov-13 | SunnyVision | 4,096 |
Seeing the names that are repeated multiple times makes me wonder how many addresses some of those companies got in aggregate. So, for companies with multiple listings:
| Company | Total Addresses Received |
| Amazon | 4,063,232 |
| Amazon, APNIC | 131,072 |
| Equinix | 11,264 |
| Microsoft | 666,624 |
| Optimum | 589,824 |
| Vodaphone | 1,118,208 |
| Bank of America | 197,632 |
As I said in my post on recent large allocations from ARIN, I don’t intend to imply anything about these companies. I just think it’s interesting to look at who is doing what with addresses. It is interesting, for instance, that all of the companies above executed transfers rather than getting addresses directly from ARIN, while ARIN still has addresses available (for a little while longer, at least).
When I looked at direct allocations, I couldn’t find any pattern of IPv4 allocations compared to IPv6 support. Here, however, the organizations buying addresses are among those conspicuously absent in IPv6 support. Amazon has little IPv6 support, Microsoft used to support IPv6 on bing.com, but no more (and not on microsoft.com, live.com, msn.com, etc.). I don’t recall seeing Vodaphone or Bank of America in any any list of IPv6 networks.