Software & Apps
How to Change DNS Server Windows 11 (3 Easy Methods)
Slow website loading, random “DNS server not responding” errors, or unreliable browsing are often caused by the DNS resolver assigned…
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Networking & Tech
Plain-English guides for networking, cybersecurity, router troubleshooting, browser fixes, DNS, TLS/SSL, AI tools, and everyday technology. Clear explanations, practical fixes, and no recycled fluff.
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No sign-up required
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Runs in your browser
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Free forever
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Zero setup
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Secure & private
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Instant results
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No sign-up required
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Runs in your browser
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Free forever
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Zero setup
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Secure & private
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Networking Tools
Free utilities — run instantly, no sign-up required.
Subnet & IP
IPv4 Subnet Calculator
Live result
Network
—Broadcast
—Usable hosts
—Mask
—IPv4 Subnet Calculator
Plan and verify any IP network instantly
Enter any CIDR block — from a home /24 to an enterprise /8 — and get the exact host range, broadcast address, and subnet mask in milliseconds. No spreadsheets, no mental arithmetic.
- Allocate IP ranges across VLANs without overlap
- Verify subnet boundaries before configuring a router
- Convert between CIDR notation and dotted-decimal masks
DNS
DNS Lookup
cloudflare.com — real output
A
104.16.132.229TTL 300MX
aspmx.l.google.compri 1TXT
v=spf1 include:_spf.google.com ~allSPFDNS Lookup
Inspect any domain's DNS configuration
Query all record types for any domain and see exactly how it's configured. Ideal for diagnosing email delivery failures, verifying CDN routing, and auditing security records like SPF and DMARC.
- Debug mail delivery failures via MX and SPF records
- Confirm CNAME chains and CDN routing are correct
- Verify DMARC and DKIM are properly deployed
Security
SSL Certificate Checker
github.com — real output
Subject
github.comIssuer
Let's Encrypt (E6)Expires
2025-04-15 ✓ ValidKey
ECDSA 256-bit · SHA-256SSL Certificate Checker
Verify TLS before it breaks in production
Run a real TLS handshake against any hostname and inspect the full certificate chain — expiry date, issuer, key algorithm, and SAN coverage. Catch misconfigurations before users see browser warnings.
- Check days remaining before certificate expiry
- Confirm wildcard certificates cover your subdomains
- Verify chain completeness and root CA trust
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What to Do After Phishing Attack: 8 Urgent Steps
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Phone Hacked? 10 Signs Happening Right Now (and How to Stop It)
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What Happens After Immorpos35.3 Infects Your PC?
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If you’ve detected it on your system and want to know exactly how Immorpos35.3 works, how it operates in the…
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How to monitor network traffic at home? 5 Free Ways (No Experience Needed)
Knowing how to monitor network traffic at home gives you full visibility into what every device on your network is…
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Why Genboostermark Software Is so Popular: What It Actually Does to Your Browser
You search for a tech problem once, then suddenly Genboostermark appears everywhere. Blog posts, ads, Reddit discussions, even “top AI…
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WiFi Works But Ethernet Doesn’t? 9 Fixes Ranked by How Often They Work
WiFi works but Ethernet doesn’t this is one of the most common networking complaints on Windows, and the good news…
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What Is Immorpos35.3 Software? Everything Currently Known
What is immorpos35.3 software? Based on available information, Immorpos35.3 appears to be a business process and workflow management platform, with…
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DNS Server Not Responding: 8 Fixes That Actually Work
A “DNS server not responding” error means your device cannot translate a website name into an IP address so nothing…
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How to Reduce Network Latency: 7 Fixes That Actually Work
Knowing how to reduce network latency makes a real difference for gaming, video calls, and remote work. When you successfully…