ViWeb Technology

Free networking tools

Diagnose DNS, IP addresses, HTTP redirects, headers, subnets, email connectivity, and domain ownership.

Networking Tools

What Is My IP?

See the public IPv4 and IPv6 addresses used by your current connection.

IPNetworkingAddressIPv4IPv6

DNS Lookup

Query DNS records for a domain and inspect the returned values.

DNSDomainLookupNetworking

CIDR / Subnet Calculator

Calculate IPv4 CIDR network ranges, usable hosts, masks, wildcards, and subnet splits.

CIDRSubnetIPv4NetworkCalculator

Redirect Checker

Follow URL redirects and review each HTTP status in the chain.

RedirectURLHTTPStatus CodeNetworking

HTTP Headers Checker

Inspect HTTP response headers and evaluate common browser security header protections.

HTTPHeadersSecurityCORSWebsite

SMTP Tester

Test SMTP connection settings and diagnose mail server responses.

SMTPEmailNetworkingTest

IP Address Lookup

Look up the approximate location, ISP, ASN, and network owner for any public IP address.

IPCheckerLocationISPNetworking

Whois Lookup

Look up domain registration and nameserver information.

WhoisDomainLookupNetworking

Choose the right network diagnostic

Start with the symptom you can observe, then move through related checks. DNS and Whois explain naming and ownership, IP and CIDR tools explain addressing, and HTTP, redirect, and SMTP tools test application-facing behavior.

Explore other groups: Featured ViWeb Apps, Security Tools, Text and Data Tools, Utility Tools, Design Tools, Information & Resources, Cloud Cost Tools.