Real network lookups that actually run in your browser. The Gizmo 421 network tools query live DNS resolvers, public registry data, and address space directly from your device — no backend relay servers, nothing logged, no sign-up. Built by an IT engineer who got tired of ad-choked lookup sites.
DNS Lookup
Query live A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA records against Google or Cloudflare resolvers.
lookup →Whois Lookup
Registry ownership data straight from RDAP: registrar, dates, status flags, and nameservers.
lookup →What Is My IP
Your public IPv4/IPv6 address, city-level location, ISP, ASN, and timezone — instantly.
check →IPv6 Subnet Calculator
Expand, compress, and subnet any IPv6 address. First/last address, range size, and prefix math.
calculate →IPv4 Subnet Calculator
IPv4 subnetting with CIDR ranges, network and broadcast addresses, usable host counts, and binary views of every value.
calculate →Email Auth Lookup
SPF, DKIM, and DMARC verdicts for any domain — with lookup budgets and policy details.
check →URL Encoder
Strict and URL-safe percent-encoding, both directions, plus real punycode for international domains.
convert →IP Range Expander
CIDR to first/last address and back — minimal CIDR coverage for any IPv4 range, exact IPv6 math.
expand →Each of these is a front end to an open, public API — DNS-over-HTTPS for the resolver queries, RDAP for registry data, and public IP echo services for the address lookup. Everything is fetched directly by your browser; there is no intermediary server of ours in the path, and no query history is stored anywhere on our side.