List of domain registrars · Integrations
IONOS
IONOS is a German web host and domain registrar based in Montabaur. It started in 1988 as 1&1 Internet, is part of United Internet, and has been listed on the Frankfurt Stock Exchange since 2023. It sells domains alongside hosting, email, website builders and cloud servers.
| WHOIS privacy | Included at no extra cost |
|---|---|
| Support | Live chat, Phone, Email or tickets, Help center, 24/7 |
| Reviews | 4.5 out of 5 from about 45,000 reviews on Trustpilot (October 2026) |
| Lemon Domains | Connects by API, so your AI can read and manage these domains |
| Website | ionos.com |
IONOS MCP
Lemon Domains is the unofficial IONOS MCP server. Connect your IONOS account by API once, and Claude, ChatGPT, Cursor or any MCP client can answer questions about your IONOS domains next to the domains you hold at every other registrar. Connections start read only, so your AI changes only what you allow.
- “Which of my IONOS domains expire in the next 60 days?”
- “Is auto-renew on for every domain at IONOS?”
- “Did the nameservers change on any of my IONOS domains this week?”
Connect IONOS · How the domain MCP server works · Track IONOS renewals
Lemon Domains is independent and not affiliated with IONOS.
IONOS API
| Status | Integrated |
|---|---|
| API key | How to get a IONOS API key |
| Documentation | developer.hosting.ionos.com |
| Eligibility | The IONOS Developer API is for IONOS hosting and domain customers. Some contract types and regions may not have API access yet; if IONOS refuses the key, use CSV import instead. |
About IONOS
| Headquarters | Montabaur, Rhineland-Palatinate, Germany |
|---|---|
| Founded | 1988 |
| Ownership | Public, Frankfurt Stock Exchange: IOS; majority owned by United Internet |
| Part of | IONOS (United Internet) |
| Domains under management | About 7 million |
| Type | Web host that registers domains |
| ICANN accreditation | IANA ID 83 |
| Site languages | German, English, Spanish, French, Italian |
| RDAP server | https://rdap.ionos.com/ |
IONOS history
| 1988 | Founded in Germany as 1&1 Internet. |
|---|---|
| 2000 | The parent becomes United Internet, with the web business in 1&1 Internet AG. |
| 2016 | Warburg Pincus takes a stake in the hosting business. |
| 2018 | 1&1 merges with ProfitBricks and rebrands as 1&1 IONOS. |
| 2023 | Lists on the Frankfurt Stock Exchange. |
Domain management features
- DNSSEC
- Two-factor sign-in
- URL forwarding
- Email forwarding
- Move domains to another account
Listed where we confirmed IONOS offers it. Some features cost extra or only cover certain extensions.
Payments and programs
| Payment methods | Credit and debit cards, PayPal, Apple Pay, Google Pay |
|---|
Services
| Service | Check it on lemon.domains |
|---|---|
| Domain registration | Run a domain report |
| DNS hosting | Look up DNS records |
| Email hosting | Check email records |
| Web hosting | Find who hosts a site |
| SSL certificates | Check an SSL certificate |
| Website builder |
IONOS support
| Channels | Live chat, Phone, Email or tickets, Help center |
|---|---|
| Hours | 24/7 |
| Contact | Contact IONOS |
The review score is Trustpilot's, read in October 2026. Lemon Domains doesn't collect, rate or edit reviews.
Domain extensions IONOS sells
Confirmed on its site: .at, .co.uk, .com, .de, .es, .fr, .info, .it, .me, .net, .org, .tv, .uk.
Transferring a domain away from IONOS
In Domains, open Renewal & Transfer, select the domain and click Show Authorization Code. Turn off the transfer lock first.
Give the code to the new registrar to start the transfer. Most extensions can't move within 60 days of registration or a previous transfer. IONOS's guide
IONOS in Lemon Domains
Connect IONOS with an API key and every IONOS domain joins your other registrars in one list, syncs once a day, and is there for your AI through MCP, the API and the CLI.
- How it connects
- Daily sync by API key
- Get an API key
- IONOS API settings
- Lemon Domains IP addresses
- 2.31.94.66
- API reference
- IONOS API docs
What you can do with IONOS domains
In Lemon Domains
- Bring in your domains · Synced daily by API
- See expiry, auto-renew and lock status
On IONOS's site
- Edit DNS records
- Change nameservers
- Turn the transfer lock on or off
- Turn auto-renew on or off
- Renew a domain
- Buy a new domain
- Get a transfer code
Connect IONOS to Lemon Domains
Three steps: create a read-only API key at IONOS, add it to Lemon Domains, and your domains sync once a day from then on. Connect as many IONOS accounts as you have.
Create a read-only API key at IONOS
IONOS keys cannot be limited to read-only or to the Domains API: one key covers domains, DNS and SSL. Create a separate key just for Lemon Domains so you can delete it on its own.
The IONOS Developer API is for IONOS hosting and domain customers. Some contract types and regions may not have API access yet; if IONOS refuses the key, use CSV import instead.
- 1Sign in at developer.hosting.ionos.com with your IONOS customer login and open API Keys.
- 2If IONOS asks you to activate API access first, follow its steps (it is free).
- 3Create a new key named “Lemon Domains”.
- 4Copy the public prefix and the secret into the two fields in Lemon Domains. Both are needed. The secret is only shown once.
Add it to Lemon Domains
- 1Sign in to Lemon Domains (it's free), open Connections and choose IONOS.
- 2Give the connection a friendly name, like “IONOS personal” or “IONOS clients”. Connect each IONOS account separately.
- 3Paste your public prefix and secret.
- 4Click Test connection. Lemon Domains checks the API key and shows how many domains it can see, without saving anything.
- 5Tick the checkbox to confirm you understand the risks, pick the project new domains go into, and click Connect and import. Your domains appear straight away and sync once a day after that.
What Lemon Domains reads
- Domain names (including internationalised names)
- Status, such as active, expired or pending transfer
- Expiry and registration dates
- Whether auto-renew is on
- Transfer lock
- WHOIS privacy
Lemon Domains only ever sends read requests to IONOS: each integration has a fixed list of read-only calls it may make, so it never renews, transfers or changes a domain. Your API key is encrypted at rest and never shown again.
If something goes wrong
- IONOS rejects the API key
- Copy it again with no spaces at either end. Some registrars only show the secret once, so create a new key if you didn't save it.
- The key has an IP restriction
- Lemon Domains connects from 2.31.94.66. Add it to the API key's allowed IPs, or remove the restriction.
- Some domains are missing
- Make sure the API key belongs to the IONOS account (or sub-account) that holds those domains. Connect each account separately.
Rather not use an API key? Import by paste or CSV
Copy your list from the IONOS portal, paste it into Lemon Domains, and you're done. Re-import any time to refresh. Paste or CSV import needs no IONOS credentials at all.
Open your IONOS domain overview
- 1Open your IONOS account at ionos.com and go to the domain list.
- 2If the list paginates, switch to "show all" or the largest page size so every IONOS domain is visible.
- 3Copy the visible list, or export to CSV if IONOS offers it from the account area.
- 4In Lemon Domains, click Import, paste the list or upload the CSV, and map the columns. Lemon Domains previews everything before it commits.
- 5Give the registrar account a friendly label (for example "IONOS personal" or "IONOS client work") so sub-accounts stay distinct.
Related registrars
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| Integrated | |
| Integrated | |
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| Blocked |
Sources: the ICANN list of accredited registrars and the IANA registrar ID registry (refreshed 2026-10-24), and IONOS's own site and documentation (reviewed October 2026). This page is also available as Markdown and JSON. Something out of date? Tell us.
Frequently asked questions
Does Lemon Domains support IONOS domains?
Yes. Connect your IONOS account with an API key and Lemon Domains syncs your domains automatically once a day. The IONOS Developer API is for IONOS hosting and domain customers. Some contract types and regions may not have API access yet; if IONOS refuses the key, use CSV import instead. You can also import by pasting your domain list from the IONOS dashboard or uploading a CSV export. Multiple IONOS accounts are supported with friendly labels so sub-accounts stay distinct in the unified portfolio.
How do I get a IONOS API key?
Sign in at developer.hosting.ionos.com with your IONOS customer login and open API Keys. If IONOS asks you to activate API access first, follow its steps (it is free). Create a new key named “Lemon Domains”. Copy the public prefix and the secret into the two fields in Lemon Domains. Both are needed. The secret is only shown once. IONOS keys cannot be limited to read-only or to the Domains API: one key covers domains, DNS and SSL. Create a separate key just for Lemon Domains so you can delete it on its own.
Do I need to share my IONOS password?
No. Connecting by API uses an API key you create at IONOS, not your password. IONOS keys cannot be limited to read-only or to the Domains API: one key covers domains, DNS and SSL. Create a separate key just for Lemon Domains so you can delete it on its own. Keys are encrypted at rest. Lemon Domains only ever sends read requests. Or skip the API and paste your list or upload a CSV.
Can I track multiple IONOS accounts?
Yes. Add one connection per IONOS account, each with its own friendly name. Personal and business logins, sub-accounts, and client accounts all sit side by side in one dashboard.
Does Lemon Domains renew my IONOS domains?
No. Renewal still happens at IONOS. Lemon Domains tracks expiry dates and auto-renew status so you know exactly when to act, but the renewal button stays at IONOS.
Can AI assistants query my IONOS domains?
Yes. The Lemon Domains MCP server lets ChatGPT, Claude, Cursor and any MCP client query your full portfolio, including IONOS domains, in plain English. Choose read-only or read-and-write access for each token.
Is IONOS ICANN-accredited?
Yes. IONOS is on the ICANN list of accredited registrars, so it can register generic extensions such as .com directly with the registries.
What is IONOS's IANA ID?
83. The IANA registrar ID appears in the registrar field of a domain's public record, so it shows which registrar a domain is with.
What other names does IONOS operate under?
Its accreditations are also held as IONOS SE. Domains registered through any of them can show those names as the registrar.
Is there an MCP server for IONOS domains?
Yes. Lemon Domains connects to IONOS by API and serves your IONOS domains through its remote MCP server, so Claude, ChatGPT, Cursor and any MCP client can answer questions about them. It is independent of IONOS and not affiliated with it, so the same connection also covers your domains at every other registrar.
Does IONOS have an API?
Yes. Lemon Domains connects to IONOS by API and syncs your domain list every day, with expiry dates and renewal settings. Your AI assistant can then answer questions about those domains through the Lemon Domains MCP server.
What domain extensions does IONOS sell?
Its price list includes .com, .net, .org, .info, .me, .tv, .co.uk, .at, .de and .es, among others.
Does IONOS include WHOIS privacy?
Yes. IONOS hides your contact details in the public record at no extra cost, for the extensions whose registry allows it. Some country-code extensions, such as .us, don't allow privacy at all.
How do I contact IONOS support?
IONOS offers support by live chat, phone, email or tickets and help center (24/7). IONOS offers phone support. Its contact page is https://www.ionos.com/help/domains/.
What does IONOS offer besides domain names?
DNS hosting, Email hosting, Web hosting, SSL certificates and Website builder.
What do customers say about IONOS?
IONOS has a TrustScore 4.5 out of 5 from about 45,000 reviews on Trustpilot, as of October 2026. Lemon Domains doesn't collect or edit reviews; read them on Trustpilot.
How do I transfer a domain away from IONOS?
In Domains, open Renewal & Transfer, select the domain and click Show Authorization Code. Turn off the transfer lock first. Then give the code to the new registrar to start the transfer.