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customer.io

Oct 26th 2026 12:45 AM

1API GmbH

unsigned

Yes

Nov 26th 2025 01:01 PM

Customer.io appears to be a domain used for customer relationship management and marketing automation. It's a well-established domain with a good reputation, but caution is advised due to its unsigned DNSSEC status, which may indicate security risks.

Data on this page is collected by cside's crawler, which monitors third-party scripts across the public web.

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Helpful
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Rarely seen
Vendor

Customer.io

Category: marketing

Description

Customer.io is a customer engagement platform that helps businesses send targeted messages (email, SMS, push notifications, in-app) based on customer behavior and data.

AI Review

The scripts from Customer.io are predominantly focused on analytics and user behavior tracking, persistently collecting data during user interactions on payment pages by employing cookies and localStorage for user identification and profile building. Although the intent is to enhance user experience and optimize transaction success, the extensive data collection raises significant concerns regarding user privacy, particularly when such tracking occurs within sensitive financial contexts. Continuous monitoring of user engagement not only captures metrics on behavior but poses risks of inadvertently recording sensitive input interactions, thereby blurring the lines between necessary analytics and invasive surveillance. Dependencies on third-party services heighten supply chain risks, as any breach or mishandling by Customer.io could translate directly into compromised customer data security. While the absence of recent alerts indicates stable performance, the depth of data handling practices necessitates ongoing scrutiny to ensure compliance with data protection regulations and to prevent exposure to potential data breaches or misuse. Organizations using these scripts should validate that data collection remains strictly necessary for performance enhancement and does not encroach upon sensitive user information.

Script hostnames

customer.io customeriomail.com
WHOIS Information
Registrar 1API GmbH
Registration: October 26th, 2011
Expires: October 26th, 2026
Updated: November 26th, 2025
Nameservers
ns-1181.awsdns-19.org. 205.251.196.157
ns-1893.awsdns-44.co.uk. 205.251.199.101
ns-499.awsdns-62.com. 205.251.193.243
ns-618.awsdns-13.net. 205.251.194.106
Meta Tags
viewport
width=device-width, initial-scale=1
theme-color
#0B353B
description
Explore Customer.io, the data-driven platform for personalized customer journeys across all channels, fueled by first-party data.
application-name
Customer.io Marketing Website
author
customer.io
author
customer.io
generator
Next.js
referrer
strict-origin
creator
customer.io
publisher
customer.io
robots
index, follow
googlebot
index, follow, max-video-preview:-1, max-image-preview:large, max-snippet:-1
category
technology
sentry-trace
1d755d91085acca186507d26e6d792d1-b9d91c5e8bd3cc4e-1
baggage
sentry-environment=vercel-production,sentry-release=09a822c78206e752e17b2680e87444040ae8ebd0,sentry-public_key=002f6ca5c0ef09fbfca1916b4b8d16b6,sentry-trace_id=1d755d91085acca186507d26e6d792d1,sentry-org_id=4509764547641344,sentry-transaction=GET%20%2F,sentry-sampled=true,sentry-sample_rand=0.3135574091039921,sentry-sample_rate=1
image_src
https://cdn.sanity.io/images/onirtmj2/production/10390db7c2394eae65523bbaafced08666b75189-1200x630.png?w=1200&h=628&fit=crop&auto=format
format-detection
telephone=no, address=no, email=no
og:title
Customer.io Platform: Automation, Data, Content Creation
og:description
Explore Customer.io, the data-driven platform for personalized customer journeys across all channels, fueled by first-party data.
og:url
https://customer.io
og:site_name
customer.io
og:locale
en_US
og:image
https://cdn.sanity.io/images/onirtmj2/production/10390db7c2394eae65523bbaafced08666b75189-1200x630.png?rect=0,1,1200,628&w=1200&h=628&fit=crop&auto=format
og:type
website
twitter:card
summary_large_image
twitter:title
Customer.io Platform: Automation, Data, Content Creation
twitter:description
Explore Customer.io, the data-driven platform for personalized customer journeys across all channels, fueled by first-party data.
twitter:image
https://cdn.sanity.io/images/onirtmj2/production/10390db7c2394eae65523bbaafced08666b75189-1200x630.png?rect=0,1,1200,628&w=1200&h=628&fit=crop&auto=format
al:web:url
https://fly.customer.io
al:web:should_fallback
true
sentry-trace
1d755d91085acca186507d26e6d792d1-ec708b5d08dfe847-1
baggage
sentry-environment=vercel-production,sentry-release=09a822c78206e752e17b2680e87444040ae8ebd0,sentry-public_key=002f6ca5c0ef09fbfca1916b4b8d16b6,sentry-trace_id=1d755d91085acca186507d26e6d792d1,sentry-org_id=4509764547641344,sentry-transaction=GET%20%2F,sentry-sampled=true,sentry-sample_rand=0.3135574091039921,sentry-sample_rate=1
SSL Certificate
Status:

Enabled

Expires: September 12th, 2026
Issuer:
Security Posture
HSTS
CSP
DNSSEC

customer.io is one of thousands of third-party scripts on the web.

Most sites run dozens of third-party scripts and can't say what each one does. cside monitors every script on your site and catches the ones that change or turn malicious.

DNS Records
Hostname Type TTL Priority Content
customer.io NS 172800
ns-1181.awsdns-19.org.
customer.io NS 172800
ns-1893.awsdns-44.co.uk.
customer.io NS 172800
ns-499.awsdns-62.com.
customer.io NS 172800
ns-618.awsdns-13.net.
customer.io A 60
76.76.21.21
customer.io MX 60 1
aspmx.l.google.com.
customer.io MX 60 10
aspmx2.googlemail.com.
customer.io MX 60 10
aspmx3.googlemail.com.
customer.io MX 60 5
alt1.aspmx.l.google.com.
customer.io MX 60 5
alt2.aspmx.l.google.com.
customer.io TXT 60
"1password-site-verification=NKRDO4YCMBDD7KNUO4PN6RZCA4"
customer.io TXT 60
"MS=ms56053829"
customer.io TXT 60
"OSSRH-70026"
customer.io TXT 60
"airtable-verification=a839ac25097d07e90b6725421494b506"
customer.io TXT 60
"anthropic-domain-verification-h4s30h=RXWAAyC4VDThCnWjaprWPkUET"
customer.io TXT 60
"asv=8738dd37f3c5a1368cba93d24b4a1e17"
customer.io TXT 60
"cursor-domain-verification-m2k2b5=XfoK2FPHAUqoNHiCpHtqY2fXP"
customer.io TXT 60
"docusign=48e7526a-7539-4ad0-b672-7a94c3a20c29"
customer.io TXT 60
"facebook-domain-verification=62g2j16g5qkvf38ekdrtxiez0bsqei"
customer.io TXT 60
"google-site-verification=HbwteWh_QF6HnNCDLL_1X_GRwURBkYEdFAVM00rxf_k"
customer.io TXT 60
"google-site-verification=gsxlVNPtm1JCawWVNMCOVuWLK9lhzdr4Dofz-V-lovo"
customer.io TXT 60
"have-i-been-pwned-verification=a9d6f2edb8654dcfe04e310cdc9a000a"
customer.io TXT 60
"hubspot-developer-verification=NDkzOTIwZWMtMDVkNS00YTAzLThlMDQtZDJmYzVjNzc5Zjgw"
customer.io TXT 60
"jetbrains-domain-verification=rdxczp2suguw502vrx4cqksy"
customer.io TXT 60
"linear-domain-verification=wetdfvhymmbh"
customer.io TXT 60
"loom-site-verification=4dac5f34468e49a299444383229599d5"
customer.io TXT 60
"miro-verification=89a8ecb5df4f4febc758723fcfabd5af59041414"
customer.io TXT 60
"mixpanel-domain-verify=d5c389d5-df00-473a-8263-3932c19beecb"
customer.io TXT 60
"notion-domain-verification=DHmczCmyAqc8TGp6DPbfWBxLb9lSgvPv7wSOiiJfAJK"
customer.io TXT 60
"openai-domain-verification=dv-icOHzM0IplqgpTNoO3nJaRCX"
customer.io TXT 60
"ps-cd-verification=6d210b55-ec4b-4105-a1d7-7a73c78619fd"
customer.io TXT 60
"sinch-domain-verification=77675a95-7309-44bf-9483-5f9020edc778"
customer.io TXT 60
"slack-domain-verification=XRnWU545ZVlzHN85aeTWX7xzunEJk8Ouav9KjN7Q"
customer.io TXT 60
"v=spf1 include:helpscoutemail.com include:_spf.google.com include:servers.mcsv.net include:amazonses.com include:mail.zendesk.com ~all"
customer.io TXT 60
"zapier-domain-verification-challenge=3373ff99-18e1-4a49-8e81-67d830eb392b"
customer.io SOA 900
ns-1181.awsdns-19.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

FAQ

Frequently Asked Questions

View all

This domain is analyzed as part of cside's domain directory to identify third-party scripts and their purposes. The summary provides information about what services, tools, or scripts this domain hosts, helping website owners understand which third-party services are being loaded on their sites.

The risk score is calculated based on multiple security factors including SSL certificate validity, DNSSEC status, domain registration details, and historical security data. A higher score indicates lower risk, while a lower score suggests potential security concerns that should be investigated.

The SSL certificate information shows whether the domain uses HTTPS encryption, when the certificate was issued, when it expires, and who issued it. This helps verify the domain's security posture and identify potential certificate-related vulnerabilities that could affect your website's security.

Third-party script domains can be compromised or used maliciously. By monitoring domain information like registration details, SSL certificates, and DNS records, you can identify suspicious changes, expired certificates, or domains that may pose security risks to your website and users.

Domain information is regularly scanned and updated to provide the most current security intelligence. The last scanned timestamp shows when the most recent analysis was performed, ensuring you have up-to-date information about the domain's security status.

If you identify a high-risk domain loading scripts on your website, you should investigate why it's being used, verify its legitimacy, and consider removing or replacing it if it's not essential. Use cside's platform to monitor and block suspicious third-party scripts to protect your users from potential security threats.

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