Disposable Email Domains on Hetzner: 1,158 Use Its Servers

Updated 10 November 2026 · Volt Ghost team

Hetzner at a glance

The services behind the number

Six IPv4 addresses carry most of the group. Each row below is one mail host or a pair of hosts that always appear together:

Those seven groups add up to 856 of the 1,158. The remaining 302 domains are spread over about 180 other host names; 89 of them run their own mail. host under the domain itself. The mail.tm server is described in full on our mail.tm server page, which also covers its strict SPF and DMARC setup.

Old domains, still answering

Unlike the networks that host this year's bulk batches, Hetzner's share is weighted towards the oldest part of the list: 446 of the 1,158 were added in October 2018, when the list's first big import landed, and they still had a working MX server on 10 November 2026.

The ten biggest networks

Disposable email is concentrated. We found MX servers on 236 different organisations' networks, but the top ten hold 5,514 of the 6,656 mapped domains (83%).

Why big mailbox providers look different

Large mail providers receive on their own networks: Gmail on Google's AS15169, Outlook.com on Microsoft's AS8075, iCloud on Apple's AS714 (see iCloud's MX records) and Proton on its own AS62371 (see Proton Mail's records). Temp mail services rent servers from general hosting companies instead, which is why a few rented machines at Hetzner can answer for hundreds of throwaway domains.

Blocking: network, address or domain?

Blocking the whole network is the wrong tool. Hetzner's address space also serves company mail servers, shops and SaaS products, so a network rule would reject real sign-ups. A rule on the six busiest addresses above would catch about two thirds of this group but break as soon as a service moves, as GPTMail did this month. A list or a lookup per address is still the precise check; the other network pages cover DigitalOcean, Contabo, OVHcloud.

How we counted: on 10 November 2026 we read the MX records of all 9,894 domains in our copy of the disposable email domains list through Cloudflare's public DNS-over-HTTPS resolver, resolved every MX host name to its IPv4 addresses, and mapped each address to the network (autonomous system) that announces it, using Team Cymru's IP-to-ASN service. 6,722 domains had a working MX host and 6,656 of them mapped to at least one network. A domain with MX hosts on two networks counts on both. First-listed years come from the public Git history of the open-source list our copy is taken from; SPF and DMARC counts come from our full-list scan of 9 November 2026.

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