The WIDE project signed a contract of collaborative research with JPRS and has been measuring deployment ratio of domain authentication since April 2005. We measure it in May and November from 2011. JPRS gives us a list of domains under .jp and the WIDE project checks whether or not authentication information exists for each domain.
As of November 2011, approximate deployment ratio of domain authentitaions is:
(With the "Total" below, dividing SPF and DK by MX, respectively)
| Category | Registered | MX | SPF | DK |
|---|---|---|---|---|
| AD(Members of JPNIC) | 273 | 227 | 113 | 6(11) |
| AC(Universities, Technical schools, Incorporated schools) | 3523 | 3313 | 1221 | 14(43) |
| CO(Incorporated companies, Limited companies) | 347022 | 323529 | 168704 | 1262(1553) |
| GO(Government organizations, Government-affiliated organizations) | 745 | 563 | 524 | 2(14) |
| OR(Foundation, Aggregate corporation) | 27719 | 26070 | 12347 | 103(128) |
| NE(Network services) | 16398 | 12488 | 4304 | 94(124) |
| GR(Arbitrary organization) | 7455 | 6412 | 2460 | 24(30) |
| ED(Schools including primary, junior and senior high schools) | 4684 | 4316 | 1585 | 6(11) |
| Geographic Type | 2602 | 2204 | 693 | 4(8) |
| General-Use JP Domain Name | 830679 | 593386 | 231071 | 3454(4544) |
| Total | 1242941 | 973678 | 423331 | 4969(6467) |