We build useful tools for anyone who works with or worries about phone calls. No account. No paywall. No nonsense.
// Free tools
All tools are free to use. No signup required. More tools ship regularly.
Number lookup
Check carrier, line type, and country for any phone number instantly.
Spam score check
Cross-reference any number against public spam and scam databases.
Scam pattern checker
Match a number against known Malaysian scam patterns — Macau scam, LHDN, and more.
E.164 converter
Convert any number between E.164, national, international, and RFC 3966 formats.
Best time to call
Enter a number and get the caller's local timezone and whether it's a reasonable hour.
Country code lookup
Search any country for its dialling prefix, number format rules, and emergency numbers.
SIP code decoder
Paste any SIP response code and get a plain-English explanation and common causes.
VoIP bandwidth calc
Choose a codec and number of concurrent calls — get exact bandwidth needed in Kbps.
DTMF tone generator
Click a phone keypad in your browser and hear real DTMF tones — useful for IVR testing.
Vanity number decoder
Convert 1-800-FLOWERS style letter numbers to digits, or find vanity words for any number.
MOS score calculator
Enter jitter, latency, and packet loss — get an estimated call quality MOS score.
Community scam board
Submit and search Malaysian scam numbers reported by the community. Crowdsourced protection.
Bulk number lookup
Upload a CSV of numbers and get carrier and line type data for all of them at once.
Caller ID reputation
Full spam reputation report for any number — history, carrier hops, and community reports.
Sazrika Foundation exists to make telephony knowledge and tools accessible to everyone. Whether you're checking a suspicious number, debugging a SIP trunk, or protecting someone you care about — these tools are here, free, no strings attached.