How do I check a 5-digit or 6-digit SMS shortcode?

Simply paste the text message or sender shortcode (e.g. 266378 or 938763) into the checker above. Our tool evaluates sender reputation, link destinations, and message phrasing.

Can scammers spoof shortcodes or bank text threads?

Yes. Sender ID spoofing allows scammers to make a text message appear inside your existing bank or delivery thread, even if it comes from an unauthorized source.

What are the biggest red flags in an SMS scam text?

Shortened URLs (bit.ly/tinyurl), urgent payment requests, unexpected package updates, and texts from 10-digit mobile numbers claiming to be major banks.

Should I reply 'STOP' to a suspicious text message?

Only if you know the sender is a legitimate company you signed up for. Replying 'STOP' to a scammer confirms your line is active, leading to more scam texts.

Free SMS & Shortcode Scam Checker

Check an SMS text or shortcode before you tap that link.

Scammers rely on SMS to send fake delivery notices, bank alerts, and urgent warnings from 5-digit shortcodes or 1-800 numbers. Paste any text message or shortcode below for an instant safety check.

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Free online SMS text message checker

Lookup 5-digit shortcodes & 1-800 numbers

Detects fake delivery, bank alerts & smishing links

Why SMS text messages & shortcodes deserve extra scrutiny

Text messages feel personal and urgent. Without detailed email headers, localized numbers, 5-digit shortcodes, or spoofed sender names are often used to make dangerous messages look real.

The text comes from an unexpected 5- or 6-digit shortcode

Shortcodes (like 266378 or 938763) are used by legitimate companies, but scammers also spoof them or use lookalike toll-free numbers to trick you into opening fake portals.

The sender claims a package cannot be delivered

A text message pretending to be USPS, AusPost, or FedEx asking for a small redelivery fee is the #1 smishing attack worldwide.

The message warns of a locked bank or card account

Scammers send fake security alerts via SMS pushing you to tap a link immediately to reverse a charge or verify identity.

You are asked to tap a shortened URL (bit.ly, tinyurl)

The safest moment to check an SMS is before tapping a shortened link that masks the real destination website.

What IsThisSpam checks before you trust a sender

Quick verdicts are useful, but the real value is understanding why something looks safe, uncertain, or risky.

Shortcode & Sender ID verification

We analyze whether the shortcode or display name aligns with legitimate enterprise messaging channels.

Impersonation patterns

Scammers use terms like 'Support Team' or 'Security Alert' to panic recipients into fast compliance.

High-pressure urgency tactics

Demands for action 'within 24 hours' or legal action threats are standard high-risk smishing indicators.

Context from embedded links

We inspect extracted domain reputation and shortened link paths to uncover malicious phishing portals.

Related guides

Use the checker for the fast answer, then read the deeper guidance for recurring scam patterns.

How to Identify a Fake Delivery Text

A full breakdown of USPS, FedEx, and postal text scams flooding mobile phones.

Read the guide

Why You Shouldn't Click Links in Texts

Learn how shortened links in SMS messages compromise personal and financial data.

Read the guide

FAQ

These are the questions people usually ask right before they click, reply, or pay.

Free scan first, deeper analysis when you need it

Check the sender before you trust the message.

Start with a fast scan, then move to SuperScan when the message involves money, account access, or sensitive documents.