ネットワークデスク

A Record Lookup. Look up IPv4 A records. The result stays on this page.

Look up mail exchanger records and priorities. The result stays on this page.

Look up TXT records (SPF, verification tokens). The result stays on this page.

Check which CAs may issue certificates for a domain. The result stays on this page.

Reverse DNS Lookup. Find the PTR record for an IP. The result stays on this page.

Check record values from resolvers worldwide. The result stays on this page.

Validate the DNSSEC chain of trust for a domain. The result stays on this page.

DoH Lookup. Resolve records over DNS-over-HTTPS. The result stays on this page.

Test a DoH/DoT endpoint for availability and validity. The result stays on this page.

Full delegation, SOA, NS, MX and glue health report. The result stays on this page.

Reverse IP Lookup. List domains hosted on an IP. The result stays on this page.

Punycode Converter. Convert IDN domains to/from Punycode. The result stays on this page.

Approximate location, ISP and ASN for an IP. The result stays on this page.

Export all prefixes of an ASN as ACL/prefix-list. The result stays on this page.

Check RPKI validity of a prefix/origin pair. The result stays on this page.

Domain registrar, dates and name servers. The result stays on this page.

RDAP Lookup. Structured registration data via RDAP. The result stays on this page.

IP Blacklist Checker. Check an IP against DNSBLs. The result stays on this page.

Detect whether an IP belongs to VPN/proxy/hosting. The result stays on this page.

Check whether an IP belongs to AWS, Azure, GCP, Cloudflare etc. The result stays on this page.

Export provider IP ranges formatted for firewalls. The result stays on this page.

Bulk MAC Vendor Lookup. Look up vendors for a list of MACs. The result stays on this page.

Generate random or vendor-prefixed MACs. The result stays on this page.

Convert MAC between colon, hyphen, Cisco dot formats. The result stays on this page.