DNSLink uses DNS TXT records to map
a domain name (like
ipfs.io) to an IPFS address. Because you can edit your
DNS records, you can use them to always point to the latest version of an
object in IPFS (remember that an IPFS object’s address changes if you modify
the object). Because DNSLink uses DNS records, the names it produces are also
usually easy to type and read.
A DNSLink address looks like an IPNS address, but it uses a domain name in place of a hashed public key:
Just like normal IPFS addresses, they can include links to other files:
When an IPFS client or node attempts to resolve that address, it looks for a
TXT record for
ipfs.io with content like:
dnslink=/ipfs/<CID for your content here>
For example, if you look up
ipfs.io’s DNS records, you’ll see its DNSLink entry:
$ dig +noall +answer TXT ipfs.io ipfs.io. 59 IN TXT "dnslink=/ipfs/QmYNQJoKGNHTpPxCBPh9KkDpaExgd2duMa3aF6ytMpHdao"
Based on that, this address:
Will get you this block:
Publishing via a Subdomain
You can also publish DNSLink records using a special subdomain named
_dnslink. This is useful when you want to improve the security of an automated setup or delegate control over your DNSLink records to a third-party without giving away full control over the original DNS zone.
docs.ipfs.io does not have a TXT record, but the page still loads
because a TXT record exists for
$ dig +noall +answer TXT _dnslink.docs.ipfs.io _dnslink.docs.ipfs.io. 34 IN TXT "dnslink=/ipfs/QmeveuwF5wWBSgUXLG6p1oxF3GKkgjEnhA6AAwHUoVsx6E"