Know what is reachable.
Know from everywhere.
Understand how Internet Mapper actively probes IPv4 and IPv6 reachability and correlates observed responsiveness with real-time BGP route and AS-path changes.
Continuously verify
Monitor 3M active IPv4 and IPv6 subnets.
Reduce geographic bias
Observe from 500 crawlers across the most effective locations.
Correlate route and state
Connect path movement with actual endpoint responsiveness.
Reachability without the local-monitor blind spot
Internet Mapper verifies operational state from a globally distributed crawler fleet, helping teams distinguish destination failure from congestion or routing conditions near a single monitoring location.
A global verification fabric
500 crawlers are deployed globally, including all major Internet exchanges, to observe reachability and path changes from the network locations that provide the clearest signal.
- Reduce false positives caused by localized congestion
- Compare reachability across regions, providers, and exchanges
- Detect destination failures with stronger independent evidence
Continuously verified subnet state
3M active IPv4 and IPv6 subnets are checked continuously so teams work from current infrastructure state.
- Detect when critical assets or providers go dark
- Track regional micro-outages and partial reachability
- Support IPv4 and IPv6 operations in one model
Clean signals at global scale
Internet Mapper separates legitimate reachability observations from spoofed and malicious traffic, preserving a trustworthy view as scan volume grows.
- Filter background Internet noise before it reaches analysts
- Record verified state transitions instead of redundant active signals
- Reconstruct historical conditions for incident review
What does an active reachability probe establish?
It establishes whether a tested IPv4 or IPv6 endpoint responded from a specific source, time, protocol, and configuration. It does not by itself establish complete application health or universal reachability from every network.
How does reachability probing complement BGP monitoring?
BGP data shows advertised routes and AS paths, while active probing checks whether IPv4 and IPv6 endpoints respond. Correlating both gives teams stronger context for whether a routing change coincides with an observed availability change.
Does Internet Mapper probe both IPv4 and IPv6 reachability?
Yes. Internet Mapper continuously verifies active IPv4 and IPv6 addresses from globally distributed Internet locations.
Can reachability differ by region or provider?
Yes. Partial outages, routing policy, congestion, filtering, or provider conditions can make an endpoint reachable from one location and unreachable from another. Distributed observations help expose that variation.
What is active IPv4/IPv6 reachability probing?
Active IPv4/IPv6 reachability probing tests whether an endpoint responds from a specific Internet location, time, protocol, and configuration. Internet Mapper correlates those observations with BGP route and AS-path changes to provide stronger operational context without treating a response as proof of complete application health.
- Probe result
- Shows observed endpoint responsiveness under the stated test conditions.
- BGP context
- Shows advertised route and AS-path changes that may help explain a reachability shift.
- Operational use
- Helps compare regions and providers and distinguish localized conditions from broader failure.
Know what the Internet means for your infrastructure
See how Internet Mapper can reveal dependencies, model disruption, and turn global routing telemetry into action.