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Does your connection work over IPv4, IPv6 or both?
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Check whether an address is valid, and what kind of address it is.
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PTR records with forward confirmation.
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Compare answers from several public resolvers.
WHOIS / RDAP
Registration data for domains, IP networks and ASNs.
TLS Certificate Check
The certificate a server presents, its chain and expiry.
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Your request headers, and the response headers of any public URL.
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ASN Lookup
Holder, registry and every prefix an AS announces.
IP Range to CIDR
Convert an address range into the smallest set of CIDR blocks.
CIDR Calculator
Network, broadcast, masks and host counts for any prefix.
Subnet Calculator
Split networks into subnets, IPv4 and IPv6.
IP Converter
Binary, hex, integer, expanded and reverse forms of an address.
IPv4 to IPv6
IPv4-mapped, 6to4 and NAT64 representations.
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WHOIS & RDAP Lookup
141.101.90.40
WHOIS / RDAP
141.101.90.40
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