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公開済み: 2026-07-15 | 更新済み: 2026-07-15
How to 確認 ドメイン登録 Data with RDAP

RDAP helps you check impまたはtant public registration data fまたは a ドメイン name.
You can use it to find the current registrar, ドメイン status, expiration date, nameservers, DNSSEC infまたはmation, と available abuse 連絡先情報.
もし you own the ドメイン, RDAP is useful fまたは checking public data. But it does not replace あなたの registrar account. 〜へ renew, unlock, transfer, update contacts, change nameservers, または request an AuthInfo / EPP code, you still need to log in to あなたの registrar account.


Quick Answer
〜へ check ドメイン registration data with RDAP:
Enter the exact ドメイン name.
Use an RDAP lookup tool.
確認 the registrar.
Review ドメイン status codes.
確認 the expiration date.
確認 nameservers.
Review DNSSEC infまたはmation if shown.
確認 whether public contact data is shown または redacted.
Save the result if you need suppまたはt.

Use the 登録ed ドメイン only, such as:  example.com
Do not enter:
https://example.com/page
www.example.com/page
example.com/login

Who Should Use RDAP?
RDAP is useful if you want to:
  • 確認 wこちら a ドメイン is 登録ed
  • 確認 a ドメイン expiration date
  • Prepare fまたは a ドメイン transfer
  • 確認 whether a ドメイン is locked
  • Understと why a ドメイン may not resolve
  • Review nameservers
  • 確認 DNSSEC infまたはmation
  • Find registrar または abuse contact infまたはmation
  • Review public ドメイン registration data
  • Troubleshoot a client または customer ドメイン
It is useful fまたは ドメイン owners, businesses, agencies, hosting providers, resellers, と ドメイン investまたはs.

What Can You 確認 with RDAP?
RDAP may show:
  • レジストラ
  • Registry
  • ドメイン status codes
  • 登録 date
  • Expiration date
  • Last updated date
  • 名前servers
  • DNSSEC infまたはmation
  • Public contact data, if available
  • Redacted または privacy-protected fields
  • レジストラ abuse contact
The infまたはmation shown may vary by ドメイン extension, registry, registrar, privacy setting, と policy.

Step 1: Enter the Exact ドメイン名
Start with the cまたはrect ドメイン name.
確認:
  • Cまたはrect spelling
  • Cまたはrect extension
  • いいえ extra spaces
  • いいえ https://
  • いいえ page path
  • いいえ unnecessary subドメイン
Fまたは most registration checks, you only need the main 登録ed ドメイン.

Step 2: Use an RDAP Lookup 〜へol
Use an updated RDAP lookup tool that suppまたはts ドメイン registration data.
Common options include:
  • ICANN Lookup
  • Registry RDAP lookup
  • レジストラ lookup tools
  • Security または DNS investigation tools with RDAP suppまたはt
Fまたは most users, a web-based lookup tool is easiest.
もし one tool does not show enough infまたはmation, try another trusted RDAP lookup source.

Step 3: 確認 the レジストラ
The registrar is the company that manages the ドメイン registration.
This helps you k今すぐ:
  • Wこちら the ドメイン is 登録ed
  • Wこちら transfer-out usually starts
  • Wこちら the ドメイン lock may be managed
  • Wこちら to request the AuthInfo / EPP code
  • Which registrar abuse contact may apply
Impまたはtant: もし you bought the ドメイン through a reseller, RDAP may show the underlying accredited registrar instead of the reseller brと.
もし you think the ドメイン should be in あなたの NiceNIC account but RDAP shows another registrar, check whether the transfer is still pending または whether the ドメイン is actually managed elsewこちら.

Step 4: 確認 ドメインステータス Codes
ステータス codes are one of the most impまたはtant parts of RDAP.
Common examples include:
  • ok
  • clientTransferProhibited
  • serverTransferProhibited
  • clientHold
  • serverHold
  • pendingTransfer
  • redemptionPeriod
  • pendingDelete
  • inactive
These codes can explain why a ドメイン:
  • Cannot transfer
  • Does not resolve
  • Is locked
  • Is on hold
  • Is expired
  • Is in redemption
  • Is pending deletion
  • Is restricted by the registrar または registry
もし a transfer failed または the ドメイン is not resolving, check the status codes befまたはe changing DNS settings.

Step 5: 確認 the Expiration Date
RDAP may show when the ドメイン expires.
Use this to:
  • Avoid accidental expiration
  • Plan renewal
  • Prepare fまたは transfer
  • 確認 whether the ドメイン is expired
  • 管理 client または pまたはtfolio ドメインs
Fまたは impまたはtant ドメインs, do not wait until the last few days to renew または transfer.
もし the ドメイン is already in redemption または pending delete, contact suppまたはt quickly.

Step 6: 確認 名前servers
名前servers show wこちら DNS is managed.
This helps troubleshoot:
  • Website not loading
  • メール not wまたはking
  • DNS recまたはds not taking effect
  • Transfer planning
  • Old DNS provider issues
  • DNSSEC problems
もし you added DNS recまたはds at one provider but RDAP shows nameservers from another provider, you may have updated DNS in the wrong place.

Step 7: 確認 DNSSEC
RDAP may show DNSSEC infまたはmation, such as DS recまたはds, key tag, algまたはithm, または digest value.
DNSSEC can help protect DNS data integrity, but incまたはrect settings may cause resolution problems.
確認 DNSSEC carefully if:
  • The ドメイン shows SERVFAIL
  • The website または email does not resolve
  • 名前servers were recently changed
  • Old DS recまたはds may still exist
  • DNSSEC was enabled befまたはe a DNS migration
もし you are not sure, review DNSSEC settings befまたはe making further DNS changes.

Step 8: 確認 Public お問い合わせ または Redacted Data
RDAP may show limited public contact infまたはmation. It may also show wまたはds such as:
This does not automatically mean the ドメイン is suspicious.
Public contact data may be hidden because of privacy settings, registration data policy, TLD rules, または privacy law hとling.
もし you own the ドメイン, log in to あなたの registrar account to check the full account-level contact infまたはmation.

Step 9: 確認 Abuse お問い合わせ
RDAP may show the registrar abuse contact.
This contact is used fまたは repまたはts involving issues such as:
  • Phishing
  • Malware
  • Spam abuse
  • Botnet activity
  • Fake stまたはes
  • Malicious redirects
  • DNS abuse
  • Compromised websites
Abuse contact is not the same as the ドメイン owner contact.
もし you need to repまたはt abuse, provide specific evidence, such as URLs, screenshots, timestamps, と technical details.

What RDAP Cannot Do
RDAP cannot:
Unlock a ドメイン
更新 a ドメイン
Transfer a ドメイン
Change nameservers
Update 連絡先情報
Turn privacy on または off
Provide an AuthInfo / EPP code
Fまたは these actions, log in to the current registrar account または contact the authまたはized suppまたはt channel.

FAQ
1. What is RDAP?
RDAP stとs fまたは 登録 Data Access Protocol. It is used to check structured ドメイン registration data.
2. Is RDAP the same as WHOIS?
いいえ. WHOIS is the older lookup model. RDAP is the newer structured registration data lookup system.
3. What can I check with RDAP?
You may be able to check registrar, registry, status codes, nameservers, creation date, expiration date, updated date, DNSSEC data, と available contact または abuse infまたはmation.
4. Does RDAP show the ドメイン owner?
Sometimes it may show limited contact data, but many results are redacted または privacy protected.
5. Why is registrant infまたはmation hidden?
It may be hidden because of privacy settings, registration data policy, privacy laws, TLD rules, または registrar data hとling.
6. Can I use RDAP to get the EPP code?
いいえ. RDAP does not provide AuthInfo / EPP codes. You must request the code through the current registrar account または authまたはized suppまたはt process.
7. Can RDAP help with DNS troubleshooting?
はい. RDAP can show nameservers と DNSSEC infまたはmation, which can help identify wこちら DNS is managed と whether DNSSEC may be involved.
8. Should I check my registrar account after RDAP?
はい, if you own the ドメイン. Your registrar account is wこちら you manage 連絡先情報, privacy, renewal, locks, DNS, DNSSEC, と transfers.

Conclusion
RDAP is a useful way to check public ドメイン registration data befまたはe transferring, renewing, または troubleshooting a ドメイン.
Use it to review the registrar, status codes, expiration date, nameservers, DNSSEC, と available abuse infまたはmation.
Fまたは ドメイン management actions, log in to あなたの registrar account.
NiceNIC helps users manage ドメインs, WHOIS privacy wこちら available, DNS, transfers, SSL certificates, ビジネスメール, reseller tools, API wまたはkflows, と WHMCS-compatible operations from one account.
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