DNS Record Lookup
Look up DNS records including A, AAAA, MX, NS, SOA, CNAME, TXT, and CAA records for any domain
Hosting & Network
buf.io runs on AS7018, with DNS by NS1 and email configured.
- Hosting network
- AS7018AS7018
- Managed DNS
- NS1
- Configured
- IPv6 (AAAA)
- Not enabled
- CAA pinning
- Set
Sits alongside 25,303 other sites on AS7018. Stable here since we started watching (Sep 21, 2026).
The apex and www are the same hosting — the apex via A records, www via a CNAME to rb.buf.io.
DNS Records for buf.io
| Hostname | Type | TTL | Priority | Content |
|---|---|---|---|---|
| buf.io | MX | 0 | 10 | smtp.buf.io |
| buf.io | SOA | 3600 | dns1.p03.nsone.net postmaster.dns1.p03.nsone.net 1792781920 3600 3600 1209600 3600 | |
| buf.io | A | 0 | 104.49.67.92 | |
| buf.io | TXT | 0 | v=spf1 a mx ip4:104.49.67.92 ~all | |
| buf.io | NS | 0 | dns3.p03.nsone.net | |
| buf.io | NS | 0 | dns2.p03.nsone.net | |
| buf.io | NS | 0 | dns4.p03.nsone.net | |
| buf.io | NS | 0 | dns1.p03.nsone.net | |
| buf.io | CAA | 0 | 0 issue letsencrypt.org | |
| buf.io | CAA | 0 | 0 iodef mailto:ca@buf.io | |
| www.buf.io | CNAME | 0 | rb.buf.io | |
| www.buf.io | A | 0 | 104.49.67.92 |
Get alerted the moment buf.io's DNS changes
This page is today's snapshot. Turn on monitoring and we'll watch buf.io continuously, notifying you the moment anything moves across all three signals:
Uptime
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DNS changes
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TLS certificate
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About DNS Records
DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:
- SOA (Start of Authority) - Contains administrative information about the zone
- NS (Nameserver) - Specifies authoritative nameservers for the domain
- A (Address) - Maps a domain to an IPv4 address
- AAAA - Maps a domain to an IPv6 address
- CNAME (Canonical Name) - Creates an alias pointing to another domain
- MX (Mail Exchange) - Specifies mail servers for the domain