What Is a Captive Portal? The Complete Guide.

A captive portal is a web page that intercepts a user’s internet access before it is granted. When someone connects to a WiFi network with a captive portal, instead of accessing the internet immediately, they are redirected to a specific page — typically a login form, terms of service page or branded splash page — that they must interact with before internet access is permitted.

How does a captive portal work?

When your device connects to a WiFi network with a captive portal, the access point or router performs a DNS hijack or HTTP redirect. Any web request you make is intercepted and redirected to the portal page. This happens before you are on the "real" internet — you are in a walled garden where only the portal page and a whitelist of pre-approved domains are accessible.

Once you complete the required action on the portal page — accepting terms, entering details, logging in — the access point adds your device (identified by its MAC address) to an authorised list and grants full internet access. The portal typically fires a final redirect to a welcome page or the site you originally tried to visit.

Types of captive portal

1. Click-through portal

The simplest form. Guests see a page with your branding and terms. They click "Accept" and internet access is granted. No data is captured. This is effectively a legal disclaimer for the WiFi use.

2. Login portal (data capture)

Guests are asked to enter personal details — name, email, mobile number — before access is granted. This turns every WiFi connection into a captured marketing lead. GDPR-compliant login portals include explicit consent checkboxes for marketing.

3. Social login portal

Guests log in with Facebook, Google or Apple. The venue receives a token and sometimes basic profile data. The data is owned by the social platform, not the venue, which limits its marketing utility.

4. SMS / OTP portal

Guest enters their mobile number and receives a one-time passcode. Confirms their number, receives internet access. A verified mobile number is captured.

5. AI-powered marketing portal (Telexico Connect)

A fully branded splash page with data capture, explicit GDPR consent, gamification (Spin to Win), loyalty programmes, automated SMS, review requests and post-connection marketing — all built by AI from a business description in 30 seconds. This is the modern, marketing-oriented evolution of the captive portal.

What is a captive portal used for?

• Customer data capture — collecting name, mobile, email and date of birth with explicit consent
• Legal compliance — ensuring guests accept acceptable use terms
• Marketing automation — using captured data for SMS campaigns, birthday offers and win-back messages
• Google review generation — inviting customers to share their experience
• Loyalty programmes — tracking visits and rewarding returning customers
• Network segmentation — keeping guest traffic separate from business systems

Is a captive portal legal?

Yes — when implemented correctly. In the UK, captive portals that collect personal data must comply with UK GDPR (Data Protection Act 2018) and PECR (Privacy and Electronic Communications Regulations) if the data is used for marketing. Key requirements:

• Explicit, freely given consent for marketing (not pre-ticked boxes)
• WiFi access must not be conditional on accepting marketing
• Clear explanation of what data is collected and why
• Clickable links to Terms and Privacy Policy
• Audit trail of when and how consent was obtained

What hardware supports captive portals?

Most business-grade access points support external captive portal redirect, including UniFi, TP-Link Omada, Grandstream GWN, Cisco Meraki, MikroTik and Aruba. Consumer-grade home routers typically do not support external captive portals.

How much does captive portal software cost?

Basic captive portal software starts from £5 per site per month (Telexico Connect WiFi plan). Full marketing automation including SMS, reviews, loyalty and AI features ranges from £19–£49 per site per month.