According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Firebase (Google) is the SaaS sender for 1,819 domains — 0.29% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Firebase is Google's cloud application platform, offering backend-as-a-service capabilities including email sending for transactional and event-triggered workflows. Google operates Firebase as part of its cloud infrastructure, and organisations using Firebase for email route their outbound mail through Google's SMTP infrastructure and authentication systems.
Firebase's footprint is concentrated in smaller and mid-market .com domains, reflecting adoption among startups and growing teams rather than enterprises. For deliverability professionals and senders testing against a realistic cross-section of domains, Firebase represents a common authentication infrastructure choice in the smaller-organisation segment and should be understood as a characteristic sending posture in that market.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 23 | 1.3% |
| Top 100,000 | 246 | 13.5% |
| Top 1,000,000 | 1,353 | 74.4% |
| Unranked | 197 | 10.8% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 951 | 52.3% | |
| .io | 90 | 4.9% | |
| .ai | 89 | 4.9% | |
| .app | 60 | 3.3% | |
| .org | 49 | 2.7% | |
| .net | 45 | 2.5% | |
| .co | 38 | 2.1% | |
| .jp | 29 | 1.6% | |
| .com.br | 28 | 1.5% | |
| .de | 19 | 1.0% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,819 domains.
| Type | Service | Domains | Share of Firebase (Google) users |
|---|---|---|---|
| Mailbox | Google Workspace | 1,060 | 58.3% |
| Mailbox | Microsoft 365 | 208 | 11.4% |
| Mailbox | Self-Hosted | 85 | 4.7% |
| Mailbox | Generic / unmatched (mail.*) | 55 | 3.0% |
| Mailbox | Unknown / Other | 38 | 2.1% |
| Mailbox | Hosted Email (Rackspace/IONOS) | 35 | 1.9% |
Firebase publishes SPF include mechanisms that authorise its SMTP servers to send on a domain's behalf. Because Firebase's email service is shared across many lightweight applications, outbound IP addresses are typically pooled across multiple Firebase tenants. This means domains sending via Firebase inherit both the reliability of Google's infrastructure and the reputation consequences of other applications on the same IP ranges; if other Firebase users send to spam traps or exhibit poor authentication practices, it can degrade delivery rates for the entire pool. This pooled-reputation dynamic is intrinsic to managed email services targeting smaller organisations and requires monitoring if Firebase is a primary send channel.
See the full Firebase (Google) data page (KPI cards, trend, sample domains) →
Firebase is Google's cloud platform for building web and mobile applications, with backend services including email sending. When a domain uses Firebase for email, it adds Firebase's SPF include to its SPF record, authorising Firebase's SMTP infrastructure to authenticate mail on that domain's behalf.
1,819 domains in the Tranco top-1M use Firebase (Google) as their SaaS sender as of July 13, 2026 (0.29% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Firebase (Google) accounts for 0.29% of SPF-publishing domains 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.
Firebase (Google) is growing — its share moved +0.01 pp over the last 30 days (as of July 13, 2026).
Firebase (Google)'s largest TLD is .com (52.3% of its domains); it appears across 170 TLDs in total.