DNS infrastructure that doesn't go down when it matters.
ZenDNS is carrier-grade, DDoS-resilient DNS infrastructure with anycast delivery and full visibility — built for ISPs who can't afford "we didn't know DNS was down until customers called."
DNS is invisible — until it breaks
For most ISPs, DNS is the first thing subscribers notice failing and the last thing monitored properly. A resolver outage looks like "the whole internet is down" to a subscriber, and by the time support tickets pile up, the damage to trust is already done.
Two tiers, scaled to your subscriber base
Standard DNS
Up to 100,000 subscribers
- Reliable managed DNS infrastructure
- Admin console with monitoring GUI
- Role-based access: Admin + Viewer
- Alerts via SMS/Email on issues
Premium DNS
100,000 – 1,500,000 subscribers
- Everything in Standard, plus:
- Multi-site DNS (Anycast)
- Standalone Primary + Secondary DNS
- Built for high-scale, high-reliability needs
Applies to both tiers: a web-based admin console to monitor DNS health in real time, two access levels (Admin: full control, Viewer: view-only — useful for giving visibility to a wider team without risk), and automatic SMS/Email alerts if something goes wrong with the DNS server, so you don't find out from your own subscribers complaining.
Built on real carrier DNS operations experience
Anycast delivery
Multi-site DNS with anycast routing (Premium) — queries resolve at the nearest healthy site, cutting latency and containing localized failures.
DDoS-resilient by design
Built from the ground up for carrier-scale query volume and abuse patterns, not adapted from a small-office DNS tool.
Full visibility
Live monitoring GUI and role-based access mean your NOC team sees DNS health without needing shell access to production resolvers.
Three purpose-built layers under one platform
ZenDNS
The platform and dashboard layer — where your team monitors health, manages access, and reviews alerts.
ZenRecursor
The resolution engine — handling the query volume and answering subscriber DNS lookups reliably at carrier scale.
ZenLoadbalancer
The access control and traffic layer — routing and distributing query load across your DNS nodes.