1
Which DNS record type maps a hostname to an IPv6 address?
2
Which DNS record type designates the mail server for a domain, with a priority value?
3
Which TXT-based e-mail authentication record verifies which servers may send mail for a domain?
4
Which web service is the community search engine for Certificate Transparency entries?
5
Which HTTP response header discloses the software behind a web server?
6
Which search operator restricts results to a single web site or domain?
7
In WHOIS output, which field records the date a domain was first registered?
8
Which service, run by the Internet Archive, lets you view historical snapshots of web pages?
9
GPS and camera-exposure data of a photo is stored in which metadata standard?
10
Which community project catalogues open-source intelligence tools by category (originally on GitHub)?
11
Which tool harvests e-mail addresses, hostnames and subdomains from search engines for a target domain?
12
Which search engine indexes internet-connected devices and exposes their open ports?
13
A classic Google dork for finding open directory listings uses which intitle pattern?
14
Which DNS record type is commonly used to carry domain-ownership verification tokens?
15
Which browser developer-tools panel lists every network request a page makes?
16
Which e-mail authentication standard cryptographically signs outbound mail for a domain?