OCN (NTT Japan) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 13, 2026), OCN (NTT Japan) is the mailbox provider for 142 domains — 0.02% of 664,797 domains with MX records. Its strongest TLD is .co.jp (46.5% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-13 DNS snapshot.
What OCN (NTT Japan) represents in this dataset
NTT Communications OCN business and ISP mailbox infrastructure in Japan.
Directory category: Mailbox. The classification comes from primary MX record (lowest preference). It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-13 snapshot shows about OCN (NTT Japan)
Across 8 distinct TLDs its top three are .co.jp (46.5%), .jp (22.5%), .or.jp (16.2%) — together 85.2% of the 142 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is MailWise (mwprem) (ESP, 105 domains, 73.9% of them), followed by Amazon SES (4.9%). Directly comparable by the same detection rule: Self-Hosted, Google Workspace, Microsoft 365. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-13); a domain appears here when its published records match the primary MX record (lowest preference) rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with OCN (NTT Japan)
What else the same 142 domains use — cross-tabulated from the same daily snapshot (2026-09-13).
| Type | Service | Domains | Share of OCN (NTT Japan) users |
|---|---|---|---|
| ESP | MailWise (mwprem) | 105 | 73.9% |
| ESP | Amazon SES | 7 | 4.9% |
| ESP | Repica WebCAS | 6 | 4.2% |
| ESP | FSI Email Security | 5 | 3.5% |
| ESP | BizMatrix | 5 | 3.5% |
| ESP | Salesforce | 4 | 2.8% |
| ESP | SendGrid (Twilio) | 3 | 2.1% |
| ESP | Cuenote | 3 | 2.1% |
| ESP | Q-Send | 3 | 2.1% |
| ESP | Kagoya (JP, sender) | 3 | 2.1% |
TLD distribution (top 8 of 8)
Frequently asked questions
How many domains use OCN (NTT Japan)?
142 domains in the Tranco top-1M use OCN (NTT Japan) as their mailbox provider as of September 13, 2026, according to Live Direct Marketing's daily DNS scan.
What is OCN (NTT Japan)'s market share?
OCN (NTT Japan) holds 0.02% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-13). The number is recomputed every day.
What are the biggest alternatives to OCN (NTT Japan)?
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-09-13).
Largest mailbox providers in this category
Self-Hosted (22.38%) · Google Workspace (21.67%) · Microsoft 365 (16.97%) · Unknown / Other (6.61%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.94%) · Proofpoint (1.88%) · Cloudflare Email Routing (1.75%) · Yandex 360 (1.61%) · Mimecast (1.46%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 142 domains.