List of domain registrars · Integrations
checkdomain
checkdomain is a German domain registrar and web host in Lübeck, founded in 2000 by Johannes Herold. It sells domains, web and email hosting, mainly to customers in German-speaking countries, and has been part of the dogado group, now group.one, since 2019.
| Extensions sold | Over 700 |
|---|---|
| Support | Phone, Email or tickets, Help center, Phone on business days |
| Lemon Domains | Connects by API, so your AI can read and manage these domains |
| Website | checkdomain.de |
checkdomain MCP
Lemon Domains is the unofficial checkdomain MCP server. Connect your checkdomain account by API once, and Claude, ChatGPT, Cursor or any MCP client can answer questions about your checkdomain 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 checkdomain domains expire in the next 60 days?”
- “Is auto-renew on for every domain at checkdomain?”
- “Did the nameservers change on any of my checkdomain domains this week?”
Connect checkdomain · How the domain MCP server works · Track checkdomain renewals
Lemon Domains is independent and not affiliated with checkdomain.
checkdomain API
| Status | Integrated |
|---|---|
| API key | How to get a checkdomain API key |
| Documentation | developer.checkdomain.de |
About checkdomain
| Legal name | checkdomain GmbH |
|---|---|
| Headquarters | Lübeck, Germany |
| Founded | 2000 |
| Founders | Johannes Herold |
| Ownership | Part of group.one |
| Type | Retail registrar |
| ICANN accreditation | Not ICANN-accredited |
| Site languages | German, English |
checkdomain history
| 2000 | Johannes Herold founds checkdomain. |
|---|---|
| 2019 | dogado acquires checkdomain. |
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 |
checkdomain support
| Channels | Phone, Email or tickets, Help center |
|---|---|
| Hours | Phone on business days |
| Contact | Contact checkdomain |
Domain extensions checkdomain sells
checkdomain says it sells over 700. Confirmed on its site: .com, .de, .online.
Transferring a domain away from checkdomain
In the customer area, open Domains, click Configuration next to the domain and choose Change provider. The code is shown and also emailed to you.
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. checkdomain's guide
Checkdomain in Lemon Domains
Connect Checkdomain with an API key and every Checkdomain 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
- Checkdomain API settings
- Lemon Domains IP addresses
- 2.31.94.66
- API reference
- Checkdomain API docs
What you can do with Checkdomain domains
In Lemon Domains
- Bring in your domains · Synced daily by API
- See expiry, auto-renew and lock status
On Checkdomain'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 Checkdomain to Lemon Domains
Three steps: create a read-only API key at Checkdomain, add it to Lemon Domains, and your domains sync once a day from then on. Connect as many Checkdomain accounts as you have.
Create a read-only API key at Checkdomain
Create a separate API token just for Lemon Domains, limited to reading domains where Checkdomain offers that, so you can revoke it on its own.
- 1Sign in to Checkdomain and open your account data, then the API section.
- 2Create an API token for Lemon Domains. If you can choose permissions, allow reading domains only.
- 3Copy the token and paste it in Lemon Domains.
Add it to Lemon Domains
- 1Sign in to Lemon Domains (it's free), open Connections and choose Checkdomain.
- 2Give the connection a friendly name, like “Checkdomain personal” or “Checkdomain clients”. Connect each Checkdomain account separately.
- 3Paste your api token.
- 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
Lemon Domains only ever sends read requests to Checkdomain: 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
- Checkdomain 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 Checkdomain 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 Checkdomain portal, paste it into Lemon Domains, and you're done. Re-import any time to refresh. Paste or CSV import needs no Checkdomain credentials at all.
- 1Open your Checkdomain account at checkdomain.de and go to the domain list.
- 2If the list paginates, switch to "show all" or the largest page size so every Checkdomain domain is visible.
- 3Copy the visible list, or export to CSV if Checkdomain 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 "Checkdomain personal" or "Checkdomain client work") so sub-accounts stay distinct.
Other registrars in Germany
| Integrated | |
| Integrated | |
| Blocked | |
| Blocked | |
| Blocked | |
| Blocked |
Sources: the ICANN list of accredited registrars and the IANA registrar ID registry (refreshed 2026-10-24), and checkdomain'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 Checkdomain domains?
Yes. Connect your Checkdomain account with an API key and Lemon Domains syncs your domains automatically once a day. You can also import by pasting your domain list from the Checkdomain dashboard or uploading a CSV export. Multiple Checkdomain accounts are supported with friendly labels so sub-accounts stay distinct in the unified portfolio.
How do I get a Checkdomain API key?
Sign in to Checkdomain and open your account data, then the API section. Create an API token for Lemon Domains. If you can choose permissions, allow reading domains only. Copy the token and paste it in Lemon Domains. Create a separate API token just for Lemon Domains, limited to reading domains where Checkdomain offers that, so you can revoke it on its own.
Do I need to share my Checkdomain password?
No. Connecting by API uses an API key you create at Checkdomain, not your password. Create a separate API token just for Lemon Domains, limited to reading domains where Checkdomain offers that, so you can revoke 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 Checkdomain accounts?
Yes. Add one connection per Checkdomain 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 Checkdomain domains?
No. Renewal still happens at Checkdomain. Lemon Domains tracks expiry dates and auto-renew status so you know exactly when to act, but the renewal button stays at Checkdomain.
Can AI assistants query my Checkdomain domains?
Yes. The Lemon Domains MCP server lets ChatGPT, Claude, Cursor and any MCP client query your full portfolio, including Checkdomain domains, in plain English. Choose read-only or read-and-write access for each token.
Is checkdomain ICANN-accredited?
checkdomain is not on the ICANN list of accredited registrars. It registers .de domains through the country-code registry.
Is there an MCP server for checkdomain domains?
Yes. Lemon Domains connects to checkdomain by API and serves your checkdomain domains through its remote MCP server, so Claude, ChatGPT, Cursor and any MCP client can answer questions about them. It is independent of checkdomain and not affiliated with it, so the same connection also covers your domains at every other registrar.
Does checkdomain have an API?
Yes. Lemon Domains connects to checkdomain 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 checkdomain sell?
checkdomain says it sells over 700 extensions. Its price list includes .de, .com and .online.
How do I contact checkdomain support?
checkdomain offers support by phone, email or tickets and help center (Phone on business days). checkdomain offers phone support. Its contact page is https://www.checkdomain.de/echter-service/.
What does checkdomain offer besides domain names?
DNS hosting, Email hosting, Web hosting, SSL certificates and Website builder.
How do I transfer a domain away from checkdomain?
In the customer area, open Domains, click Configuration next to the domain and choose Change provider. The code is shown and also emailed to you. Then give the code to the new registrar to start the transfer.