According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), CSC / NetNames is the mailbox provider for 108 domains — 0.02% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
78.7% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. It spans 34 TLDs, led by .com (44.4%) — a broad, internationally distributed base. The service most often seen alongside it is Campaign Monitor (ESP), on 3.7% 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 | 6.5% |
| Top 1,000,000 | 85 | 78.7% |
| Unranked | 16 | 14.8% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 48 | 44.4% | |
| .co.uk | 13 | 12.0% | |
| .net | 5 | 4.6% | |
| .fr | 4 | 3.7% | |
| .org | 4 | 3.7% | |
| .org.uk | 3 | 2.8% | |
| .de | 3 | 2.8% | |
| .io | 2 | 1.9% | |
| .si | 1 | 0.9% | |
| .tv | 1 | 0.9% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 108 domains.
| Type | Service | Domains | Share of CSC / NetNames users |
|---|---|---|---|
| ESP | Campaign Monitor | 4 | 3.7% |
| ESP | Proofpoint | 2 | 1.9% |
| ESP | Sophos Email | 2 | 1.9% |
| ESP | Adestra (MessageFocus) | 1 | 0.9% |
| ESP | Mimecast | 1 | 0.9% |
| ESP | Salesforce | 1 | 0.9% |
| ESP | SendGrid (Twilio) | 1 | 0.9% |
| ESP | SALESmanago (PL) | 1 | 0.9% |
| ESP | SMTP2GO | 1 | 0.9% |
See the full CSC / NetNames data page (KPI cards, trend, sample domains) →
108 domains in the Tranco top-1M use CSC / NetNames 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.
CSC / NetNames 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.
CSC / NetNames's largest TLD is .com (44.4% of its domains); it appears across 34 TLDs in total.