“I can inspect the DNS records, confirm the certificate, and test the server without opening five different tabs.”
Raka A.
DevOps Engineer
Network diagnostics,without the noise.
Run free DNS lookups, inspect SSL certificates, validate email configuration, and troubleshoot VPS connectivity from one focused workspace.
No accountResults in secondsFree to use
CORELAB / DNS
DNS lookup
corelab.web.id
TypeValueProviderTTL
A104.21.24.155Cloudflare, Inc.300s
A172.67.190.41Cloudflare, Inc.300s
MXroute1.mx.cloudflare.netPriority 103600s
2 records
0 warnings
Healthy
Built for everyday infrastructure work
DevelopersDevOps teamsIT operationsSupport engineers
The toolkit
One place to investigate the whole stack.
Skip the bookmark folder full of single-use utilities. CoreLab keeps the most common infrastructure checks close together, with consistent results you can scan quickly.
01
DNS lookup
Inspect A, AAAA, MX, TXT, CNAME, NS, and SOA records from one clean result view.
7 record types
02
SSL inspection
Check certificate chains, validity windows, cipher details, and expiry before they become incidents.
Chain validation
03
VPS diagnostics
Run ping, HTTP, and port checks, then continue troubleshooting from an SSH console.
Live connection tests
04
Email validation
Validate syntax, MX configuration, and mailbox signals without stitching together separate tools.
Multi-step checks
05
Index checker
Review index status and suspicious page signals when a domain starts behaving unexpectedly.
Page-level signals
Illustrative community feedback
Built around the way technical teams investigate.
“The result layout makes it obvious which signal matters. That is exactly what I need during an incident.”
Maya K.
Infrastructure Lead
“CoreLab is now the first place I check when a domain migration starts behaving differently across environments.”
Daniel T.
Backend Developer
“Being able to move from a ping test to port and HTTP checks in one workflow saves a surprising amount of time.”
Arman S.
Site Reliability Engineer
“It gives our support team enough technical context to escalate an issue with evidence instead of guesses.”
Fajar P.
Technical Support Lead
“The SSL expiry and chain details are concise, readable, and easy to share with the rest of the team.”
Kevin L.
Security Analyst
Built for the incident loop
From “something is off” to a useful answer.
The interface stays out of the way: enter a target, run the relevant checks, and get structured output you can act on.
Explore all tools01
Enter one target
Start with a domain, IP address, URL, or email—whatever the issue gives you.
02
Run focused diagnostics
Use a single check or move across DNS, certificate, mail, and server layers.
03
Read the signal
Results are grouped and labeled so failures, warnings, and useful metadata stand out.
Common questions
Network diagnostics, explained clearly.
Quick answers about CoreLab's free DNS, SSL, email, VPS, and index-checking tools.
01What can I check with CoreLab?+
CoreLab provides free tools for DNS records, SSL certificates, email configuration, VPS connectivity, open ports, HTTP responses, and Google index status.
02How does the DNS lookup tool work?+
Enter a domain and choose the record types you need. CoreLab queries A, AAAA, CNAME, MX, NS, TXT, and SOA records and returns the available values with useful DNS metadata.
03Can I check when an SSL certificate expires?+
Yes. The SSL certificate checker displays certificate validity, expiry time, issuer, protocol, cipher details, alternative names, and certificate-chain information.
04Do I need an account to use the tools?+
No. CoreLab tools are available directly in the browser without registration or software installation.
No setup required
Keep CoreLab within reach for the next weird outage.
There is no workspace to configure and no agent to install. Open a tool, paste your target, and start narrowing the problem.
Open the toolkit
Ready whenever you need it