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About this tool
Explain documented Indian commercial SMS header, prefix and category-suffix formats locally without claiming sender authenticity or live DLT registration.
The DLT SMS Sender ID Explainer breaks an Indian commercial SMS header such as VZ-HDFCBK-T into its three documented parts — a two-letter provider and service-area prefix, a six-character Principal Entity header code, and a -P, -S, -T or -G category suffix — and explains what each segment means using TRAI's published 2020 prefix reference. It also recognises the 127xxx consent short-code family and plain ten-digit numbers, and it can explain up to 100 header lines at once. It describes format only: it performs no live DLT or Header Information Portal lookup and never claims a sender is genuine.
Open DLT SMS Sender ID Explainer on AltFTool — it loads instantly in your browser.
Paste sender IDs into "Enter sender IDs or headers", one entry per line and up to 100 entries — the box shows the shape it expects, such as VD-KOTAKB-S — or press "Load sample" for synthetic examples.
Press "Explain formats" and each entry is split into its two-letter provider and service-area prefix, six-character header code and -P, -S, -T or -G category suffix, with any segment it cannot match flagged rather than the whole string rejected.
"Structural explanations" cards appear beside the "Current suffix guide", and "Download format counts" saves altftool-sms-header-format-counts.json — a counts-only report that excludes the sender IDs, header codes and phone numbers you entered.
Splits provider code, service-area code, header code and category suffix separately, and flags exactly which one it could not match rather than rejecting the whole string.
Every result carries a notice that recognisable structure is a format cue only, not evidence of registration, consent, sender identity or link safety.
The JSON report contains format and category tallies with the entered sender IDs, header codes and phone numbers deliberately excluded.
They are the documented category cues: -P is promotional, -S is a non-promotional service message, -T is transactional and -G is government. A suffix outside these four is reported as an unknown category rather than being read as one of them.
The first letter is the originating access provider and the second is the telecom service area — for example J is Reliance Jio and Z is Maharashtra, giving a JZ prefix. These mappings come from TRAI's 2020 prefix reference, so later reassignments may not be reflected.
No. A well-formed header only shows the text matches a documented shape. Headers can be misused or visually imitated, and this tool makes no live DLT registration, routing, consent or content-template check — verify anything financial directly with the organisation through a number you already trust.
It matches the six-digit short-code family prescribed for consent-seeking messages, so a 127 prefix followed by three digits is flagged as that format. Matching the pattern does not prove the consent request itself, or the sender behind it, is authentic.