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385.2 M

Domains known to webXtrend

9.8 M

New domains in the last 30 days

62.8 M

Social media profiles detected

hackcu.org

Get an email when its DNS, website or certificate changes.

hackcu.org serves a website of its own over HTTPS and under www. It answers on both IPv4 and IPv6, with a valid TLS certificate and MX records for mail.

Its busiest IP address is shared with 1,028 other domains.

The most recent crawl returned the page title “HackCU — Hackathon World Cup | HackCU” and 164,017 bytes of HTML. The site links to Instagram and LinkedIn profiles.

Domain properties

Property Value Explanation
Top-level domain .org 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. yes 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 Both 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 4,105 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": "hackcu.org"}'

Create a free account Read the API docs

Detected social media networks

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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 10/18/2026
Valid to 1/16/2027
Time until expiry 85 days

Last successful crawl

Title HackCU — Hackathon World Cup | HackCU
Description 48 hours. 600+ hackers. $25K in prizes. Build, ship, and compete at Colorado's premier hackathon.
Content-Length 164,017 bytes

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

DNS history

IPv4 address First seen
104.21.30.88 5/27/2026
172.67.172.175 5/27/2026
188.114.96.0 5/20/2026
188.114.97.0 5/20/2026
104.21.30.88 4/28/2026
IPv6 address First seen
2606:4700:3032:0:0:0:ac43:acaf 4/28/2026
2606:4700:3037:0:0:0:6815:1e58 4/28/2026
2a06:98c1:3120:0:0:0:0:3 11/11/2025
2a06:98c1:3121:0:0:0:0:3 11/11/2025
2606:4700:3032:0:0:0:ac43:82a2 10/18/2025
Mail server Priority First seen
aspmx.l.google.com 1 10/30/2025
alt1.aspmx.l.google.com 5 10/30/2025
alt2.aspmx.l.google.com 5 10/30/2025
aspmx2.googlemail.com 10 10/30/2025
aspmx3.googlemail.com 10 10/30/2025
Name server First seen
ara.ns.cloudflare.com 4/28/2026
milan.ns.cloudflare.com 4/28/2026
dns1.registrar-servers.com 11/17/2025
dns2.registrar-servers.com 11/17/2025
alla.ns.cloudflare.com 10/30/2025

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

172.67.172.175 1,029 domains · here since 10/19/2026
Domain On this IP since
zzroadcup.com 9/15/2026
zxbb031.lat 10/12/2026
zurired.es 9/12/2026
zun44.com 10/22/2026
zsum.click 9/18/2026
zoom55.net 9/23/2026
zhouxingyu.dev 9/20/2026
zhemingp1.cn 10/23/2026
zhaozha.top 9/22/2026
zfrpif.com 10/15/2026
zero-seven.dental 9/17/2026
zeptriluxan.com 9/19/2026
and 1,016 more
104.21.30.88 1,028 domains · here since 10/19/2026
Domain On this IP since
zzroadcup.com 9/15/2026
zxbb031.lat 10/12/2026
zurired.es 9/12/2026
zun44.com 10/22/2026
zsum.click 9/18/2026
zoom55.net 9/23/2026
zhouxingyu.dev 9/20/2026
zhemingp1.cn 10/23/2026
zhaozha.top 9/22/2026
zfrpif.com 10/15/2026
zero-seven.dental 9/17/2026
zeptriluxan.com 9/19/2026
and 1,015 more
2606:4700:3032::ac43:acaf 1,024 domains · here since 10/19/2026
Domain On this IP since
zzroadcup.com 9/15/2026
zxbb031.lat 10/12/2026
zurired.es 9/12/2026
zun44.com 10/22/2026
zsum.click 9/18/2026
zoom55.net 9/23/2026
zhouxingyu.dev 9/20/2026
zhemingp1.cn 10/23/2026
zhaozha.top 9/22/2026
zfrpif.com 10/15/2026
zero-seven.dental 9/17/2026
zeptriluxan.com 9/19/2026
and 1,011 more
2606:4700:3037::6815:1e58 1,024 domains · here since 10/19/2026
Domain On this IP since
zzroadcup.com 9/15/2026
zxbb031.lat 10/12/2026
zurired.es 9/12/2026
zun44.com 10/22/2026
zsum.click 9/18/2026
zoom55.net 9/23/2026
zhouxingyu.dev 9/20/2026
zhemingp1.cn 10/23/2026
zhaozha.top 9/22/2026
zfrpif.com 10/15/2026
zero-seven.dental 9/17/2026
zeptriluxan.com 9/19/2026
and 1,011 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.