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Filter Chain

Rethink traffic management with NS1’s Filter Chain


NS1’s unique Filter Chain is at the heart of what makes our technology different and better than all other DNS solutions. Filter Chain in combination with NS1's RFC compliant DNS allows you to easily configure complex, customized traffic shaping algorithms perfectly suited to your application and network

Filters are like little programs that run inline for every DNS query. They are attached directly to RFC-compliant DNS records. With NS1, a single DNS record contains all the possible answers from which the Filter Chain can select the best one. Other providers have to define proprietary DNS record “types” for one-off routing strategies which are inevitably inflexible, complex and don’t scale. Filters can be combined and re-ordered to build complex algorithms perfectly tailored to your business requirements. They can be changed in an instant. NS1 supports dozens of Filter algorithms and can even build custom Filters unique to your use case. This flexibility is only available with NS1.

NS1’s DNS Filter Chain Algorithms

Combine our powerful Filter Chain algorithms to build perfectly tailored traffic management setups matching your business logic.

Intelligent Filters Dynamic Filters
PULSAR Sort answers by Pulsar performance estimates PRIORITY Failover according to prioritized answer tiers
SHED_LOAD Shed traffic if load is too high, based on realtime metrics SELECT_FIRST_N Return the first N answers
GEOTARGET_LATLONG Sort answers by distance to requester using latitude and longitude SELECT_FIRST_REGION Return all answers in the same region as the first answer
GEOTARGET_REGIONAL Sort answers by distance to requester by geographical region SHUFFLE Shuffle answers randomly
GEOTARGET_COUNTRY Sort answers by distance to requester by country, US state, and/or Canadian province STICKY Make answers “sticky” by requester IP
GEOFENCE_REGIONAL Restrict to answers in same geographical region as requester STICKY_REGION Make regions “sticky” by requester IP
GEOFENCE_COUNTRY Restrict to answers in same country, US state, or Canadian province as requester UP Remove answers that are “down”
NETFENCE_ASN Restrict to answers where Autonomous System (AS) of requester IP matches AS list WEIGHTED_SHUFFLE Shuffle answers randomly based on their weight
NETFENCE_PREFIX Restrict to answers where requester IP matches prefix list WEIGHTED_STICKY Shuffle answers uniquely per-requester with weighting