Alternatives to ack.co
Matched automatically on description, category and technology. Only sites that pass our safety checks are shown. · Report a wrong match
ack.co was registered with Spaceship, Inc. on 20 Jul 2010 and is hosted on AS16509 Amazon.com Inc. in United States of America. Its SSL certificate from Let's Encrypt is valid until 23 Dec 2026, and the site does not support HTTP/3.
On-page basics for the homepage.
Networks cache previews — changes can take time to show.
What security vendors and the WOT community say about this domain.
0 of 5 protections set up
No SPF record: any server can send mail that claims to come from this domain.
—No key at the 12 common selectors we checked. A custom selector can’t be found from DNS alone.
—No DMARC policy: receivers aren’t told what to do with mail that fails SPF and DKIM.
—Forces encrypted delivery between mail servers.
—Shows the brand logo in supporting inboxes. Optional; needs DMARC enforcement.
—Read from the domain's public DNS records.
4 of 6 recommended headers
The page is served over plain HTTP, so HTTPS can’t be enforced.
Limits where scripts can load from — the main defence against XSS.
Stops the site being framed for clickjacking.
Prevents browsers guessing file types.
Which AI crawlers this site allows in robots.txt.
From robots.txt. “Partly blocked”: kept out of some pages, not the homepage. Not every crawler follows it.
Pages and files that show who runs the site and how it handles data.
What loads and tracks visitors when the homepage opens.
Running a full browser scan of the homepage… This takes about a minute.
Internet standards that make a site faster and safer.
The path from a typed address to the final page.
732 similar domains registered in the last 90 days — possible typosquatting or phishing.
| Domain | Why it’s similar | Registered | Status | Report |
|---|---|---|---|---|
| 4ck.pw | Look-alike characters | 15 Sept 2026 | RedirectsRedirects to ybkvbz.tckqxx.com | Report → |
| 4ck.info | Look-alike characters | 10 Sept 2026 | Active website | Report → |
| ack.company | Other extension | 23 Oct 2026 | Active website | Report → |
| ack.la | Other extension | 22 Oct 2026 | No website | Report → |
| akc.capital | Typo | 7 Oct 2026 | Active website | Report → |
From CubDomain's daily newly registered domains. Similar doesn't mean malicious.
Is ack.co’s name taken on other extensions?
1 technology detected across 1 category.
Detected from headers, page source and DNS · Automatic and may be incomplete · Suggest a correction
Every IP address ack.co resolves to, and where it's hosted.
| Host | IPv4 address | TTL |
|---|---|---|
| ack.co | 44.232.173.249 | 1200 |
| ack.co | 52.40.42.113 | 1200 |
| Host | Name server | TTL |
|---|---|---|
| ack.co | launch1.spaceship.net | 1800 |
| ack.co | launch2.spaceship.net | 1800 |
| Host | Start of authority | TTL |
|---|---|---|
| ack.co | launch1.spaceship.net support.spaceship.com 1790232415 43200 3600 604800 3600 | 1800 |
| Host | Value | TTL |
|---|---|---|
| ack.co | 256 3 13 a9Kt1YCwP4YkMyenw37u6PeULaqI9knx46dB5cnqsCgXTudSc08hLugj6IMxY1d866kqNaGMtgXlKWsi52nxZQ== | 1798 |
| ack.co | 257 3 13 JBo1BrNmKp3ezPtlpzX+8JgW9gSJL6qg/x1wjpYEDC9fruwMX8gbCSzGl7lqx3kTz2KghyByLbI6dT+2zPUF8w== | 1798 |
Other domains served from 44.232.173.249. Normal for shared hosting and CDNs.
No reviews yet. Used ack.co? Be the first to say how it went.
Reviews are from CubDomain users and are separate from the security verdicts above.
Common questions, answered from this report's data.
ack.co has no community safety rating yet. Its SSL certificate is valid until 23 Dec 2026. See Security →
ack.co is registered through Spaceship, Inc. See WHOIS →
The registration expires on 19 Jul 2027 — in 8 months. See Overview →
ack.co was registered on 20 Jul 2010, making it 16 years old. See Overview →
ack.co is served from 2 IP addresses, mainly on AS16509 Amazon.com Inc. in United States of America. See Hosting →
We detected 1 technology, including jQuery UI. See Built with →
Raw registry data for ack.co. May be redacted by privacy services.
Domain Name: ACK.CO Registry Domain ID: D426638-CNIC Registrar WHOIS Server: whois.spaceship.com Registrar URL: https://www.spaceship.com/ Updated Date: 2026-07-02T18:13:32.0Z Creation Date: 2010-07-20T18:23:12.0Z Registry Expiry Date: 2027-07-19T23:59:59.0Z Registrar: Spaceship, Inc. Registrar IANA ID: 3862 Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Admin Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Tech Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Name Server: LAUNCH2.SPACESHIP.NET Name Server: LAUNCH1.SPACESHIP.NET DNSSEC: signedDelegation Billing Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Registrar Abuse Contact Email: [email protected] Registrar Abuse Contact Phone: +1.9854014545 URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/ >>> Last update of WHOIS database: 2026-11-01T07:23:58.0Z <<< For more information on Whois status codes, please visit https://icann.org/epp The registration data available in this service is limited. Additional data may be available at https://lookup.icann.org The Whois and RDAP services are provided by CentralNic, and contain information pertaining to Internet domain names registered by our our customers. By using this service you are agreeing (1) not to use any information presented here for any purpose other than determining ownership of domain names, (2) not to store or reproduce this data in any way, (3) not to use any high-volume, automated, electronic processes to obtain data from this service. Abuse of this service is monitored and actions in contravention of these terms will result in being permanently blacklisted. All data is (c) CentralNic Ltd (https://www.centralnicregistry.com) Access to the Whois and RDAP services is rate limited.
The first response from http://www.ack.co, before any redirect: caching, server and policy headers.
Four timed TCP connections to port 443 from CubDomain's servers.
CubDomain is not affiliated with ack.co. Data is collected independently from public sources and some figures are estimates, provided for information only.
Controls how much of the URL is shared with other sites.
Restricts camera, microphone and other browser features.
From the homepage's response, http://ack.co/
Spam and malware blocklists for the site's IP and mail servers.
Found in public certificate transparency logs.
Searching the certificate transparency logs… This can take up to a minute.
When the site first appeared, and what has changed since.
No changes seen since we started recording on 1 Nov 2026.