Network tools
Inspect domains, addresses, and web clients. Browser-local and remote lookup tools are clearly labelled, and every utility is available without an account.
DNS
DNS Lookup
Inspect public A, AAAA, CNAME, MX, TXT, and NS records.
Open toolMX
MX Lookup
Find mail exchangers, priorities, and their public IP records.
Open toolHEAD
HTTP Header Checker
Inspect public response headers without downloading large pages.
Open tool200
Website Status Checker
Check reachability, response status, timing, and redirects.
Open tool↪
Redirect Checker
Trace up to ten safe HTTP redirects and detect loops.
Open toolBOT
robots.txt Checker
Read and summarize a public site’s robots.txt directives.
Open toolIP
What Is My IP?
Show public request information exposed by Cloudflare.
Open toolCIDR
Local
CIDR Calculator
Calculate IPv4 CIDR network boundaries and host capacity.
Open toolMASK
Local
Subnet Calculator
Inspect IPv4 subnet masks, wildcards, and usable ranges.
Open toolIPv4
Local
IPv4 Converter
Convert IPv4 addresses between dotted, integer, hex, and binary forms.
Open tool