# Network tools

- Human page: https://happytails.ai/en/network-tools/
- Markdown: https://happytails.ai/en/network-tools.md
- Structured JSON: https://happytails.ai/agents/en/network-tools/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All network tools

- [CIDR to range](https://happytails.ai/en/network-tools/cidr-to-range/): First/last addresses, count and IPv6 support without allocating massive address lists. ([Markdown](https://happytails.ai/en/network-tools/cidr-to-range.md))

- [DNS lookup](https://happytails.ai/en/network-tools/dns-lookup/): A AAAA MX TXT CNAME NS SOA records with resolver and time. ([Markdown](https://happytails.ai/en/network-tools/dns-lookup.md))

- [DNS propagation](https://happytails.ai/en/network-tools/dns-propagation/): Real geographically distributed resolvers and timestamps. ([Markdown](https://happytails.ai/en/network-tools/dns-propagation.md))

- [IP lookup](https://happytails.ai/en/network-tools/ip-lookup/): ASN, approximate geography and data timestamp. ([Markdown](https://happytails.ai/en/network-tools/ip-lookup.md))

- [IP range to CIDR](https://happytails.ai/en/network-tools/ip-range-to-cidr/): Minimal exact covering blocks. ([Markdown](https://happytails.ai/en/network-tools/ip-range-to-cidr.md))

- [Ipv6 compress](https://happytails.ai/en/network-tools/ipv6-compress/): Compress/expand canonical IPv6 with round-trip checks. ([Markdown](https://happytails.ai/en/network-tools/ipv6-compress.md))

- [Reverse DNS](https://happytails.ai/en/network-tools/reverse-dns/): PTR query results and missing-record states. ([Markdown](https://happytails.ai/en/network-tools/reverse-dns.md))

- [Subnet calculator](https://happytails.ai/en/network-tools/subnet-calculator/): IPv4/IPv6 ranges, prefix length and usable-address conventions. ([Markdown](https://happytails.ai/en/network-tools/subnet-calculator.md))

- [What is my IP](https://happytails.ai/en/network-tools/what-is-my-ip/): Display public IPv4/IPv6 observed by endpoint. ([Markdown](https://happytails.ai/en/network-tools/what-is-my-ip.md))

- [Whois lookup](https://happytails.ai/en/network-tools/whois-lookup/): RDAP-first registration lookup with redaction and registry-specific availability. ([Markdown](https://happytails.ai/en/network-tools/whois-lookup.md))

## Read network results in their context

A network lookup is a snapshot from a particular resolver, location and time. DNS answers, routing paths and certificates can change, so a result is most useful when the query and observation time are clear.

## How to choose your next step

Check the hostname, record type or IP address carefully. Compare results using the same query and note whether a cached response may be involved.

## Common questions about network tools

### Why do DNS results differ between locations?

Resolvers can cache records for different periods, and some services deliberately return location-specific answers. A mismatch does not on its own identify a configuration fault.

### Can browser code perform every network check?

Browsers restrict arbitrary network access. Some diagnostics need a server or a public service; that service’s observation point affects what the result means.