Costco lookalike domains
Greyphish has recorded 129 domains that resemble Costco since February 2026, 21 of them in the last 90 days. Most of them (71%) are typosquats, a keystroke or two away from the real name. .com carries 89% of them, out of 12 endings in all. The pace has picked up, with 8 in the last 30 days against 5 in the 30 before. 35 certificates for unregistered .com.ph, .ph names (registry wildcard) are excluded: the registry answers for any name under those endings, so nobody had to register one to get a certificate for it.
Data as of . Public sources only.
What kind of lookalikes
Lookalikes per week
Show as a table
| Week of | Typo | Combo | Homoglyph | Total |
|---|---|---|---|---|
| 2026-04-20 | 0 | 1 | 0 | 1 |
| 2026-04-27 | 2 | 0 | 0 | 2 |
| 2026-05-04 | 0 | 0 | 0 | 0 |
| 2026-05-11 | 1 | 1 | 0 | 2 |
| 2026-05-18 | 1 | 0 | 0 | 1 |
| 2026-05-25 | 0 | 1 | 0 | 1 |
| 2026-06-01 | 1 | 0 | 0 | 1 |
| 2026-06-08 | 1 | 0 | 0 | 1 |
| 2026-06-15 | 2 | 0 | 0 | 2 |
| 2026-06-22 | 0 | 2 | 0 | 2 |
| 2026-06-29 | 0 | 1 | 0 | 1 |
| 2026-07-06 | 0 | 2 | 1 | 3 |
| 2026-07-13 | 3 | 3 | 0 | 6 |
| 2026-07-20 | 1 | 0 | 0 | 1 |
| 2026-07-27 | 0 | 2 | 0 | 2 |
| 2026-08-03 | 1 | 1 | 0 | 2 |
| 2026-08-10 | 0 | 0 | 0 | 0 |
| 2026-08-17 | 1 | 0 | 0 | 1 |
| 2026-08-24 | 0 | 1 | 0 | 1 |
| 2026-08-31 | 0 | 2 | 0 | 2 |
| 2026-09-07 | 0 | 0 | 0 | 0 |
| 2026-09-14 | 2 | 0 | 0 | 2 |
| 2026-09-21 | 1 | 1 | 0 | 2 |
| 2026-09-28 | 0 | 0 | 0 | 0 |
| 2026-10-05 | 0 | 4 | 0 | 4 |
| 2026-10-12 | 0 | 1 | 0 | 1 |
Endings
The 8 most used of the 12 top-level domains these lookalikes sit under.
| Ending | Lookalikes | Share |
|---|---|---|
| .com | 115 | 89.1% |
| .ca | 2 | 1.6% |
| .cn | 2 | 1.6% |
| .shop | 2 | 1.6% |
| .co.kr | 1 | 0.8% |
| .de | 1 | 0.8% |
| .ir | 1 | 0.8% |
| .online | 1 | 0.8% |
Where they are registered
For the 104 with a registrar in WHOIS (81% of all). Brand-protection registrars mostly hold defensive registrations made by brands themselves, so a domain there is more likely the brand's own than an imitation.
| Registrar | Lookalikes | Share | Type |
|---|---|---|---|
| GoDaddy | 18 | 17.3% | Retail |
| Media Elite Holdings | 12 | 11.5% | Retail |
| Dynadot | 11 | 10.6% | Retail |
| Above.com | 7 | 6.7% | Retail |
| Key-Systems | 6 | 5.8% | Retail |
| Spaceship | 6 | 5.8% | Retail |
| Gname | 4 | 3.9% | Retail |
| Gransy | 4 | 3.9% | Retail |
What the live ones do
Google Web Risk lists none of the 3 live ones checked against it.
3 were tracked while live and 1 has since gone down. See what to do about a lookalike.
Recent examples
The 10 most recent, written with [.] so they cannot be clicked. The brand's own domains and registrations held by brand-protection registrars are left out. A lookalike resembles Costco; it is not necessarily malicious, and none of these is a claim about who registered it or why.
costcoappointment[.]caCombo, Oct 12MX recordscostcosupports[.]onlineCombo, Oct 10MX recordsmycostco-rebate0298[.]comCombo, Oct 9Not checkedmycostco[.]irCombo, Oct 9Not checkedcostcoonlineusa[.]comCombo, Oct 6No site or mail when checkedclstco[.]comTypo, Sep 26Not checkedmycostcorefund8292[.]comCombo, Sep 21Not checkedcgstco[.]comTypo, Sep 19Not checkedcnstco[.]comTypo, Sep 14Not checkedcostcoofficial[.]comCombo, Sep 6Not checked
Or watch it free: Greyphish tells you when a new lookalike of your domain is registered or goes live.
Further reading
More in retail and e-commerce
Greyphish is not affiliated with Costco. Domains listed resemble Costco by spelling; registration alone says nothing about intent. Counts cover domains first seen in public Certificate Transparency logs and ICANN zone files; domains that Greyphish customers watch are excluded.