Domain · Tranco #2,318
customer.io
customer.io is ranked #2,318 among the world's most-visited sites (Tranco). It resolves to 76.76.21.21, hosted on Vercel, and presents a TLS certificate issued by Let's Encrypt.
HTTP 200| Tranco rank | #2,318 |
|---|---|
| IPv4 | 76.76.21.21 |
| Hosting / reverse DNS | Vercel |
| Nameservers | ns-1181.awsdns-19.org, ns-1893.awsdns-44.co.uk, ns-499.awsdns-62.com, ns-618.awsdns-13.net |
| Mail servers (MX) | aspmx.l.google.com (1), alt2.aspmx.l.google.com (5), alt1.aspmx.l.google.com (5) |
| HTTP status | 200 |
| Web server | Vercel |
| Page title | Customer.io: AI-Powered Customer Engagement Platform |
| Detected tech | Vercel |
| TLS certificate | Let's Encrypt · expires 2026-09-22 |
Notable DNS TXT records
zapier-domain-verification-challenge=3373ff99-18e1-4a49-8e81-67d830eb392bMS=ms56053829google-site-verification=HbwteWh_QF6HnNCDLL_1X_GRwURBkYEdFAVM00rxf_kv=spf1 include:helpscoutemail.com include:_spf.google.com include:servers.mcsv.net include:amazonses.com include:mail.zendesk.com ~allmiro-verification=89a8ecb5df4f4febc758723fcfabd5af59041414airtable-verification=a839ac25097d07e90b6725421494b506
More .io domains
FAQ
What is the IP address of customer.io?
customer.io resolves to 76.76.21.21 (Vercel).
Who issued the SSL certificate for customer.io?
The TLS/SSL certificate for customer.io was issued by Let's Encrypt, valid until 2026-09-22.
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Start free on Mewayz →DNS/HTTP/TLS observed 2026-08-06; registration data via RDAP. Informational only. Download JSON · CSV · Browse domains