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VLANlab

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MyNet
What Is My IP?IPv6 Test
Speed TestSoon
DNS
DNS LookupDNS PropagationDNS Health CheckerSPF Analyzer
MX LookupSoon
PTR LookupCAA Record
NS LookupSoon
SOA RecordSoon
SRV RecordDNS TraceDNS PrivacyDANE / TLSADNSSEC CheckerSPF BuilderDKIM GeneratorZone DiffPTR Zone Generator
Calculators
Subnet CalculatorCIDR Range ViewerVLSM CalculatorVLAN PlannerBandwidth CalcIPv6 Subnet CalcIP ↔ BinarySupernet CalcCIDR MergeCIDR to IP RangeCIDR SplitIPv4 → IPv6CIDR OverlapFree IP Space FinderDHCP CalculatorMTU Calculator
Lookup
WHOIS LookupDomain Age CheckerSubdomain FinderIP GeolocationASN / BGP LookupIP Blacklist CheckReverse IP LookupMAC Address LookupBGP Prefix LookupRPKI / ROA Check
Email
Email InspectorDKIM CheckerEmail HeadersSMTP TestSMTP TLS CheckMX Health CheckEmail SecurityDMARC Generator
Temp MailSoon
Testing
Is It Down?SSL/TLS CheckerOpen Port CheckerPing / LatencyHTTP InspectorRedirect ChainCSP AnalyzerTech Stack CheckerBetaTracerouteBetaOG Tag CheckerHTTP/2 + HTTP/3robots.txt ViewerSSL Cert DecoderBanner GrabberOCSP CheckerWebSocket TesterCORS TesterHTTP TimingStructured Data
PWA ManifestSoon
SEO AuditorSoon
Security
One-Time SecretHash GeneratorPassword StrengthSecurity.txtCT Log SearchAXFR Zone TestHTTP Sec ScoreWebRTC Leak TestIP Reputation
DevKit
JSON FormatterYAML FormatterText CompareBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampURL ParserURL Encoder/DecoderCron BuilderUUID / ULIDPunycode / IDNcURL BuilderBase ConverterHTTP Status CodesACL Generator
Cloud
Cloud VPC PlannerCloud IP RangeSecurity GroupsIAM Analyzer
VM Cost EstimatorSoon
K8s CIDR PlannerSoon
Firewall BuilderSoon
HCL FormatterSoon
Egress Cost CalcSoon
Cloud DNS ZoneSoon
Virtualization
Proxmox Net ConfigVMware Port GroupHyper-V vSwitchVXLAN VNI Planner
NSX-T SegmentSoon
KVM Net ConfigSoon
XCP-ng NetworkSoon
DevOps
GitHub ActionsSoon
Dockerfile GenSoon
docker-composeSoon
ArgoCD AppSoon
K8s ManifestsSoon
About

© 2026 VLANlab

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VLANlab

One tab, every tool you need.

Subnet math, DNS lookups, SSL checks, port scanning, JWT decoding, and 100+ more.
Instant results, shareable links, free forever.

No account · No ads · No tracking · No rate limits · Free for humans

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Quick Access

Subnet CalculatorCalculators
What Is My IP?MyNet
DNS LookupDNS
HTTP InspectorTesting
WHOIS LookupLookup
One-Time SecretSecurity
Text CompareDevKit
Is It Down?Testing
Domain Age CheckerLookup
SSL/TLS CheckerTesting
Open Port CheckerTesting
JWT DecoderDevKit
Unix TimestampDevKit

Built for engineers

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Instant results

Every calculation runs in your browser - no server round-trip, no waiting.

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Shareable URLs

Every result has a unique link. Share a subnet layout or IP lookup with one click.

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Dark mode first

Designed for engineers who live in terminals. Easy on your eyes at 2am.

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No login, no ads

Free forever. No account required, no tracking, no advertisements.

Learn more about what we are building and why.

The one-stop shop engineers actually want.

Free networking and security tools for engineers, sysadmins, and DevOps teams. Subnet calculator, CIDR planner, DNS lookup, SPF checker, DMARC checker, port scanner, SSL certificate checker, HTTP security headers, IP geolocation, JWT decoder, traceroute, and 100+ more - all instant, all free, no account required.

Used by network engineers to debug DNS propagation, sysadmins to validate email security records, and developers to inspect HTTP headers and decode tokens. Every result has a shareable URL. Works in any browser, no login, no ads, no rate limits.

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