AppHelp
DNS lookup for any domain or IP
Enter a domain, URL, email address or IP. Records are fetched over encrypted DNS-over-HTTPS straight from your browser to Cloudflare or Google, with TTL and DNSSEC shown.
Common tasks
- dns lookup
- dns checker
- mx lookup
- txt record lookup
- nslookup online
- dig online
- DNS 查询
Quick answer
Type a domain and press Look up. The tool queries A, AAAA, CNAME, MX, NS, TXT, SOA and CAA in parallel via DNS-over-HTTPS and shows each answer with its TTL; the Email preset also checks the _dmarc record.
How to use
- 1. Enter a nameA domain, a full URL, an email address or an IP.
- 2. Choose recordsUse a preset or toggle record types.
- 3. Look upRead answers with TTLs, copy values or all lines.
Common use cases
- Verify DNS changes and propagation at public resolvers
- Check MX, SPF and DMARC before sending mail
- Confirm CAA before issuing certificates
- Find the hostname behind an IP with PTR
Features
- 13 record types including CAA, HTTPS, DS and DNSKEY
- Common, Website and Email presets
- Cloudflare 1.1.1.1 or Google 8.8.8.8 DNS-over-HTTPS
- TTL, response code and DNSSEC (AD flag) per query
- Reverse PTR lookup for IPv4 and IPv6
- SPF, DMARC and DKIM TXT labels
Related tools
Subnet CalculatorCalculate network, broadcast, usable host range, netmask and wildcard from CIDR or dotted IP Range ↔ CIDRConvert IP ranges to the minimal CIDR list, merge and de-duplicate CIDR blocks, and check Port LookupSearch common TCP and UDP port numbers by number, range or service: SSH 22, HTTPS 443, RDP
Frequently asked questions
- Why can results differ from my computer?
- Your ISP or office resolver may cache older answers. This tool asks public resolvers directly; compare Cloudflare and Google to see propagation.
- Does AppHelp log my queries?
- No. Your browser sends them directly to the resolver you choose.
- What does DNSSEC mean here?
- The resolver validated the answer's DNSSEC signatures (AD flag).