Lookup for developers
Validate phone numbers and email addresses at signup or before you send. Stop paying to text landlines or dead numbers, keep disposable emails out of your CRM, and spot ported numbers or SIM swaps with Bird.
Jonas Becker
Alex Morgan
Trusted by engineering and product teams
shipping at global scale.
Check the details. Make the connection.
Check carrier, line type, porting, and email deliverability from one integration before you send or verify. Query phone and email signals from your backend code, terminal, or AI assistant.
lookup_phone_number
AnsweredCatch typos at signup.
Keep bad emails out of your list.
A mistyped address at checkout means a lost order confirmation, and disposable or dead mailboxes drive up bounce rates that hurt your sender reputation. Validate addresses in real time to suggest spelling fixes while the customer is still on the form, or check up to 1,000 addresses per batch before you launch a campaign.
Good things.
In your inbox.
Email address
Try another email address
Good things.
In your inbox.
Email address
Did you mean gmail.com?
aisha@gmail.com
Check the line and carrier to
stop wasted texts and SIM swap fraud.
Avoid paying to send SMS to landlines or dead numbers. Identify the serving carrier, line type, and porting status in a single call, and layer on live network presence, SIM swap detection, or a credibility score when verifying high-risk signups and logins.
Explore Lookup.
Prevent bounced emails, wasted SMS spend, and account takeover fraud from a single API.
Validate phone numbers and email addresses from your backend, CLI, or AI assistant before you send.
Email validationCatch mistyped, disposable, and dead email addresses at signup or in batches of up to 1,000.
Phone number lookupConfirm a number is valid and get its country, carrier, and line type in one API call.
Line typeDistinguish mobile numbers from landlines, VoIP, and toll-free lines so you do not waste SMS spend.
Carrier lookupIdentify the current serving carrier and original issuing network to route traffic and debug delivery.
Number portingSee whether a number has moved between carriers and when the latest port was recorded.
Network presenceQuery the live mobile network to check whether a handset is active and reachable before contacting it.
RoamingDetect whether a subscriber is roaming abroad and see which network is currently serving the device.
SIM swapSpot recent SIM card changes before sending one-time passcodes or approving sensitive account actions.
Credibility scoreUse a 0 to 100 risk score to flag suspicious or low-trust phone numbers during signup and checkout.
Scale without losing control.
Separate production and sandbox traffic into dedicated workspaces, scope API keys to the exact channels each service or agent needs, and track permission changes in the audit log.