The IOV Name Service has a block explorer in Mainnet: https://big-dipper.iov-mainnet-2.iov.one/
It is the easiest way to see the transactions getting on the IOV Name Service.
The IOV Name Service has a REST API in Testnet: https://iovnscli-rest-api.iov-mainnet-2.iov.one/.
Messages generated by the CLI can then be sent via this REST API.
You can install the CLI from the GitHub repo: https://github.com/iov-one/iovns
The IOV Name Service provides human readable address linked to a list of crypto-addresses. We called this human readable address the starname.
If you have a starname and want to resolve it, you can start here: Resolving a Starname
For getting started with the IOV Name service, addresses and IOV Tokens, you can read Addresses and IOV Tokens
If you want to register a starname, you can read here: Registering a Starname
For customising the addresses associated with your starname, you can read Setting Starname info