According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), OCN (NTT Japan) is the mailbox provider for 123 domains — 0.02% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
87.8% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .co.jp at 49.6% of its domains — a strong concentration across 8 TLDs overall. The service most often seen alongside it is MailWise (mwprem) (ESP), on 75.6% of its domains.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 7 | 5.7% |
| Top 1,000,000 | 108 | 87.8% |
| Unranked | 8 | 6.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .co.jp | 61 | 49.6% | |
| .jp | 26 | 21.1% | |
| .or.jp | 17 | 13.8% | |
| .com | 14 | 11.4% | |
| .net | 2 | 1.6% | |
| .coop | 1 | 0.8% | |
| .info | 1 | 0.8% | |
| .ne.jp | 1 | 0.8% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 123 domains.
| Type | Service | Domains | Share of OCN (NTT Japan) users |
|---|---|---|---|
| ESP | MailWise (mwprem) | 93 | 75.6% |
| ESP | Repica WebCAS | 6 | 4.9% |
| ESP | Amazon SES | 6 | 4.9% |
| ESP | FSI Email Security | 5 | 4.1% |
| ESP | Kagoya (JP, sender) | 3 | 2.4% |
| ESP | BizMatrix | 3 | 2.4% |
| ESP | SendGrid (Twilio) | 3 | 2.4% |
| ESP | Q-Send | 3 | 2.4% |
| ESP | Salesforce | 3 | 2.4% |
| ESP | ActiveGate | 3 | 2.4% |
See the full OCN (NTT Japan) data page (KPI cards, trend, sample domains) →
123 domains in the Tranco top-1M use OCN (NTT Japan) as their mailbox provider as of July 13, 2026 (0.02% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
OCN (NTT Japan) accounts for 0.02% of domains with MX records in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
OCN (NTT Japan)'s largest TLD is .co.jp (49.6% of its domains); it appears across 8 TLDs in total.