List of domain registrars · Integrations
Key-Systems (CentralNic Reseller)
Key-Systems is a German registrar for resellers and companies, based in St. Ingbert, and the company behind the CentralNic Reseller platform (formerly RRPproxy). Founded by Alexander Siffrin in 1998 and ICANN-accredited since 2000, it has been part of Team Internet Group (formerly CentralNic Group), listed in London, since 2018.
| Extensions sold | Over 1,100 |
|---|---|
| Support | Help center |
| Lemon Domains | Connects by API, so your AI can read and manage these domains |
| Website | key-systems.net |
Key-Systems (CentralNic Reseller) MCP
Lemon Domains is the unofficial Key-Systems (CentralNic Reseller) MCP server. Connect your Key-Systems (CentralNic Reseller) account by API once, and Claude, ChatGPT, Cursor or any MCP client can answer questions about your Key-Systems (CentralNic Reseller) 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 Key-Systems (CentralNic Reseller) domains expire in the next 60 days?”
- “Is auto-renew on for every domain at Key-Systems (CentralNic Reseller)?”
- “Did the nameservers change on any of my Key-Systems (CentralNic Reseller) domains this week?”
Connect Key-Systems (CentralNic Reseller) · How the domain MCP server works · Track Key-Systems (CentralNic Reseller) renewals
Lemon Domains is independent and not affiliated with Key-Systems (CentralNic Reseller).
Key-Systems (CentralNic Reseller) API
| Status | Integrated |
|---|---|
| API login | How to get a Key-Systems (CentralNic Reseller) API login |
| Documentation | kb.centralnicreseller.com |
| Eligibility | API access comes with an RRPproxy / CentralNic Reseller account. |
About Key-Systems (CentralNic Reseller)
| Legal name | Key-Systems GmbH |
|---|---|
| Headquarters | St. Ingbert, Germany |
| Founded | 1998 |
| Founders | Alexander Siffrin |
| Ownership | Part of Team Internet Group PLC (LSE: TIG) |
| Part of | Team Internet |
| Domains under management | About 5 million |
| Type | Wholesale registrar for resellers |
| ICANN accreditation | 5 accreditations, listed below |
| Site languages | German, English |
| RDAP server | https://rdap.rrpproxy.net/ |
Key-Systems (CentralNic Reseller) history
| 1998 | Alexander Siffrin founds Key-Systems. |
|---|---|
| 2000 | Becomes an ICANN-accredited registrar. |
| 2010 | Moves its headquarters to St. Ingbert. |
| 2011 | Merges with NameDrive to form KeyDrive. |
| 2018 | KeyDrive, including Key-Systems, is acquired by CentralNic Group. |
| 2022 | Renames its reseller platform RRPproxy to CentralNic Reseller. |
| 2023 | CentralNic Group is renamed Team Internet. |
Payments and programs
| Payment methods | Credit and debit cards, PayPal, Bank transfer, Prepaid account balance |
|---|---|
| Reseller program | key-systems.net |
Services
| Service | Check it on lemon.domains |
|---|---|
| Domain registration | Run a domain report |
| DNS hosting | Look up DNS records |
| SSL certificates | Check an SSL certificate |
| Reseller program |
Key-Systems (CentralNic Reseller) support
| Channels | Help center |
|---|---|
| Contact | Contact Key-Systems (CentralNic Reseller) |
Domain extensions Key-Systems (CentralNic Reseller) sells
Key-Systems (CentralNic Reseller) says it sells over 1,100. Confirmed on its site: .de.
Key-Systems in Lemon Domains
Connect Key-Systems with its API login and every Key-Systems 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 login
- Get an API login
- Key-Systems API settings
- Lemon Domains IP addresses
- 2.31.94.66
- API reference
- Key-Systems API docs
What you can do with Key-Systems domains
In Lemon Domains
- Bring in your domains · Synced daily by API
- See expiry, auto-renew and lock status
On Key-Systems'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 Key-Systems to Lemon Domains
Three steps: create a read-only API login at Key-Systems, add it to Lemon Domains, and your domains sync once a day from then on. Connect as many Key-Systems accounts as you have.
Create a read-only API login at Key-Systems
A role user limited to the QueryDomainList command. It can list your domains and nothing else, and the account's own password is never shared.
API access comes with an RRPproxy / CentralNic Reseller account.
- 1Sign in to the RRPproxy (CentralNic Reseller) control panel.
- 2Under your account settings, create a role user (restricted user) for Lemon Domains and allow it only the QueryDomainList command.
- 3If you limit the key to certain IP addresses, allow the Lemon Domains IP address shown on the connect page.
- 4Enter your account login, the role user's name and the role user's password in Lemon Domains.
Add it to Lemon Domains
- 1Sign in to Lemon Domains (it's free), open Connections and choose Key-Systems.
- 2Give the connection a friendly name, like “Key-Systems personal” or “Key-Systems clients”. Connect each Key-Systems account separately.
- 3Paste your rrpproxy login and password.
- 4Click Test connection. Lemon Domains checks the API login 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
- Nameservers
- Transfer lock
Lemon Domains only ever sends read requests to Key-Systems: each integration has a fixed list of read-only calls it may make, so it never renews, transfers or changes a domain. Your API login is encrypted at rest and never shown again.
If something goes wrong
- Key-Systems rejects the API login
- Copy it again with no spaces at either end. Check the login is the API user, not a different account.
- The key has an IP restriction
- Lemon Domains connects from 2.31.94.66. Add it to the API login's allowed IPs, or remove the restriction.
- Some domains are missing
- Make sure the API login belongs to the Key-Systems account (or sub-account) that holds those domains. Connect each account separately.
Rather not use an API login? Import by paste or CSV
Copy your list from the Key-Systems portal, paste it into Lemon Domains, and you're done. Re-import any time to refresh. Paste or CSV import needs no Key-Systems credentials at all.
- 1Open your Key-Systems account at key-systems.net and go to the domain list.
- 2If the list paginates, switch to "show all" or the largest page size so every Key-Systems domain is visible.
- 3Copy the visible list, or export to CSV if Key-Systems 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 "Key-Systems personal" or "Key-Systems client work") so sub-accounts stay distinct.
ICANN accreditations (5)
Each accreditation has its own IANA registrar ID and name. A domain registered through any of them can show that name as its registrar.
| IANA ID | Accredited name |
|---|---|
| 228 | Moniker Online Services LLC |
| 269 | Key-Systems GmbH |
| 1345 | Key-Systems, LLC |
| 1387 | 1API GmbH |
| 1444 | Unidata S.p.A. |
Related registrars
| Integrated | |
| Blocked | |
| Blocked | |
| Integrated | |
| Integrated | |
| Integrated |
Sources: the ICANN list of accredited registrars and the IANA registrar ID registry (refreshed 2026-10-24), and Key-Systems (CentralNic Reseller)'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 Key-Systems domains?
Yes. Connect your Key-Systems account with its API login and Lemon Domains syncs your domains automatically once a day. API access comes with an RRPproxy / CentralNic Reseller account. You can also import by pasting your domain list from the Key-Systems dashboard or uploading a CSV export. Multiple Key-Systems accounts are supported with friendly labels so sub-accounts stay distinct in the unified portfolio.
How do I get a Key-Systems API login?
Sign in to the RRPproxy (CentralNic Reseller) control panel. Under your account settings, create a role user (restricted user) for Lemon Domains and allow it only the QueryDomainList command. If you limit the key to certain IP addresses, allow the Lemon Domains IP address shown on the connect page. Enter your account login, the role user's name and the role user's password in Lemon Domains. A role user limited to the QueryDomainList command. It can list your domains and nothing else, and the account's own password is never shared.
Do I need to share my Key-Systems password?
Only if you connect by API. Key-Systems's API signs in with a username and password rather than an API key. A role user limited to the QueryDomainList command. It can list your domains and nothing else, and the account's own password is never shared. Credentials are encrypted at rest. Lemon Domains only ever sends read requests. If you would rather not, paste or CSV import needs no credentials at all.
Can I track multiple Key-Systems accounts?
Yes. Add one connection per Key-Systems 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 Key-Systems domains?
No. Renewal still happens at Key-Systems. Lemon Domains tracks expiry dates and auto-renew status so you know exactly when to act, but the renewal button stays at Key-Systems.
Can AI assistants query my Key-Systems domains?
Yes. The Lemon Domains MCP server lets ChatGPT, Claude, Cursor and any MCP client query your full portfolio, including Key-Systems domains, in plain English. Choose read-only or read-and-write access for each token.
Is Key-Systems (CentralNic Reseller) ICANN-accredited?
Yes. Key-Systems (CentralNic Reseller) is on the ICANN list of accredited registrars with 5 accreditations, so it can register generic extensions such as .com directly with the registries.
What is Key-Systems (CentralNic Reseller)'s IANA ID?
Key-Systems (CentralNic Reseller) has 5 IANA registrar IDs, one per accreditation: 228, 269, 1345, 1387, 1444.
What other names does Key-Systems (CentralNic Reseller) operate under?
Its accreditations are also held as Moniker Online Services LLC, Key-Systems GmbH, 1API GmbH and Unidata S.p.A.. Domains registered through any of them can show those names as the registrar.
Is there an MCP server for Key-Systems (CentralNic Reseller) domains?
Yes. Lemon Domains connects to Key-Systems (CentralNic Reseller) by API and serves your Key-Systems (CentralNic Reseller) domains through its remote MCP server, so Claude, ChatGPT, Cursor and any MCP client can answer questions about them. It is independent of Key-Systems (CentralNic Reseller) and not affiliated with it, so the same connection also covers your domains at every other registrar.
Does Key-Systems (CentralNic Reseller) have an API?
Yes. Lemon Domains connects to Key-Systems (CentralNic Reseller) 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 Key-Systems (CentralNic Reseller) sell?
Key-Systems (CentralNic Reseller) says it sells over 1,100 extensions. Its price list includes .de.
How do I contact Key-Systems (CentralNic Reseller) support?
Key-Systems (CentralNic Reseller) offers support by help center. Its contact page is https://www.rrpproxy.net/Contact/About_The_Company.
What does Key-Systems (CentralNic Reseller) offer besides domain names?
DNS hosting, SSL certificates and Reseller program.