substream.io

substream.io serves a website of its own over HTTPS. It answers on IPv4 only, with a valid TLS certificate and MX records for mail.

1,095,468 other domains share an IP address with it.

The most recent crawl returned the page title “substream.io: The open source monitoring platform.” and 155,795 bytes of HTML. The site links to X and LinkedIn profiles.

Domain properties

Property	Value	Explanation
Top-level domain	.io	Statistics for all domains we know under this TLD.
Has website	yes	A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record	yes	The domain has an MX record.
External redirect	no	The domain redirects to another domain.
Redirect to https	yes	The domain redirects to https.
Redirect to www.	no	The domain redirects to www.domain.
Only with www.	no	The domain can only be reached with the subdomain "www".
Only DNS, no website	no	There are no A or AAAA records in DNS.
IP-Address	only IPv4	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	0	Number of domains that redirect to this domain.
Reverse IP	1,095,468	Number of domains with the same IP(s).

This data through the API

The data on this page is also available as JSON: /lookup for the key facts, /reverseip, /redirect and /similar for the lists, and /dnshistory with Basic and Premium. A free account comes with an API key and 100 calls a day.

curl -X POST https://api.webxtrend.com/v1.0/lookup \
  -H 'Content-Type: application/json' \
  -d '{"token": "YOUR_TOKEN", "query": "substream.io"}'

Create a free account Read the API docs

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Websites whose start page offers something similar, found by comparing the text of their start pages, across languages. Near-identical copies, parking pages and error pages are left out. The full list of up to 100 comes through the API: similar websites.

Last SSL certificate

Issuer	Let's Encrypt
Valid from	9/29/2026
Valid to	12/28/2026
Time until expiry	73 days

Last successful crawl

Title	substream.io: The open source monitoring platform.
Description	substream.io is the open source monitoring platform that gives you the visibility you need.
Content-Length	155,795 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

DNS history

IPv4 address	Last updated
76.76.21.21	12/9/2023

Mail server	Priority	Last updated
smtp.secureserver.net	0	1/4/2024
mailstore1.secureserver.net	10	1/4/2024

Name server	Last updated
ns55.domaincontrol.com	12/9/2023
ns56.domaincontrol.com	12/9/2023

The five most recent states of each record type. The full history comes through the API: DNS history.

Most recent redirect domains

No domains found.

Reverse IP neighbours

76.76.21.21 1,095,468 domains · here since 9/18/2026

Domain	On this IP since
zzzzzem.tech	9/17/2026
zzzzzebra.com	9/13/2026
zzzzhi.com	9/17/2026
zzzyyp.cn	9/23/2026
zzzygw.com	9/14/2026
zzzygh.cn	9/19/2026
zzzybzsb.com	9/15/2026
zzzy1688.com	9/18/2026
zzzwd.com	9/19/2026
zzzventurescapital.com	9/19/2026
zzztimer.com	9/13/2026
zzztgjg.cn	9/14/2026
and 1,095,455 more

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses. The complete list of neighbours, also for an IP address, comes through the API: reverse IP lookup.

Dive into our data, search now!