Challenge overview
Lilica ran a personal website linked from her social media account @twilight_lilica. Your task is to determine when the domain name of her personal website was registered in YYYY/MM/DD format.
Flag format:
SWIMMER{YYYY/MM/DD}Initial assumptions
From lilica’s social media activity, she linked to a domain that appears to be a personal portfolio or profile site: twilight-lilica.com.
To determine the registration date, a domain WHOIS lookup (not IP WHOIS) needed to be performed. Domain WHOIS information typically includes creation/registration dates, which satisfy the challenge requirement.
Investigation process
- I located lilica’s personal website link from her social media account:
https://twilight-lilica.com/
- I visited the site and confirmed it appeared to be associated with lilica (portfolio/profile).
- I performed a domain WHOIS lookup for twilight-lilica.com. Reliable domain WHOIS sources display the creation (registration) date of the domain.
- The WHOIS results showed the following key information:
- Domain: twilight-lilica.com
- Registered On: 2025-10-05
- Updated On: 2025-10-05
- Expires On: 2026-10-05
- Registrar: GMO Internet Group, Inc. d/b/a Onamae.com
- Name servers: ns1.value-domain.com, ns2.value-domain.com
This confirmed that the domain was originally registered on 2025/10/05.
Key findings
- The domain twilight-lilica.com is directly linked from lilica’s social profile.
- A WHOIS lookup revealed that the domain was registered on 2025/10/05.
- The registration data is publicly available and lawfully retrievable via WHOIS.
Final flag / answer
SWIMMER{2025/10/05}Notes & takeaways
- Domain WHOIS is the authoritative source for domain registration dates, unlike IP WHOIS which provides hosting provider details (not applicable for domain creation dates).
- It’s important to differentiate between domain creation (what the challenge asks) and hosting records (which may show server providers but not domain age).
- The WHOIS record showed privacy protection for contact details, but the registration date was still visible, which fulfills the objective.