UC Worker shared mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), UC Worker shared is the mailbox provider for 37 domains — 0.01% of 675,489 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 37 domains in the Tranco top-1M use UC Worker shared (0.01% of domains with MX records).
- Snapshot date: 2026-09-24 — recomputed every day.
- Strongest TLD: .th (97.3% of its domains).
- Region skew: Other.
- Directory category: hosting mail bundle.
Why UC Worker shared appears in this category
Shared MX cluster behind Cloudflare (uc-workd.com).
We classify it as a hosting mail bundle from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
UC Worker shared is a mailbox provider operating as a primary MX record handler for websites in the Tranco top-one-million list. It serves a distributed footprint of smaller and medium-sized sites rather than global incumbents, with particularly high concentration in the .th (Thailand) domain namespace.
For email practitioners, UC Worker shared's presence signals a regional, long-tail provider in the infrastructure landscape. Its relevance to your deliverability programme depends on your sender footprint: if your email reaches Thai domains or regional Southeast Asian infrastructure, it warrants monitoring and testing; for globally focused sending, it typically ranks below major incumbent providers in testing priority.
Where UC Worker shared sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 2.7% |
| Top 100,000 | 4 | 10.8% |
| Top 1,000,000 | 32 | 86.5% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .th | 36 | 97.3% | |
| .co.th | 1 | 2.7% |
Significance for regional and long-tail testing
UC Worker shared's concentration in the .th space and positioning among smaller sites means its inclusion in deliverability audits is contextual. If your sender reputation and monitoring programmes span Thai domains or decentralised regional infrastructure, UC Worker shared merits attention; if your audience is primarily global or outside Thailand, it generally falls below the threshold for dedicated monitoring, though long-tail providers occasionally surface filtering or reputation anomalies worth capturing in broader audits.
See the full UC Worker shared data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is UC Worker shared and when should I test against it?
UC Worker shared is a mailbox provider handling email for smaller websites, concentrated in the .th domain space. Include it in your testing and reputation monitoring if you send to or audit Thai regional infrastructure; otherwise, prioritise larger incumbent providers unless your broader auditing strategy captures long-tail variance.
How many domains use UC Worker shared?
37 domains in the Tranco top-1M use UC Worker shared as their mailbox provider as of September 24, 2026 (0.01% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is UC Worker shared common enough to affect email deliverability testing?
UC Worker shared accounts for 0.01% 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.
Which countries or TLDs use UC Worker shared most?
UC Worker shared's largest TLD is .th (97.3% of its domains); it appears across 2 TLDs in total.