Our Network

We operate AS215011, an IPv6-only research-focused Autonomous System used to support routing and peering experiments, and to power the active measurement infrastructure behind nxthdr.

AS215011 is connected to several Internet Exchange Points (IXPs) in Europe and announces multiple prefixes for different purposes. All routing data collected by our routers is made freely available in our datasets.

IXP Servers

Our IXP-connected servers are deployed at strategic exchange points across Europe. These systems advertise the prefix 2a06:de00:50::/44.

This prefix is used for interconnection and experimentation with other networks. These servers allow us to maintain a stable presence at the edge of the Internet, participate in routing experiments, and support peering via IXPs. We also use this prefix to connect the nxthdr services to the global Internet, dogfooding our own network.

Current IXP locations:

FogIXP – Frankfurt
LOCIX  – Frankfurt
NL-ix  – Amsterdam

We gratefully acknowledge the support of individuals affiliated with the CNRS for facilitating access to servers at the NL-ix IXP in Amsterdam.

Probing Servers

Our measurement infrastructure relies on a distributed set of “probing servers”, which are used to generate active measurements such as ping and traceroute. These servers advertise two distinct IPv6 /48 prefixes:

• Anycast prefix: shared across all probing servers
• Unicast prefix: unique to each server

Both are subprefixes of 2a0e:97c0:8a0::/44, which is our primary prefix for active measurements.

BYOIP and Experimental Peering

We support experiments in two primary ways:

• Bring Your Own IPs: We can advertise your IPv6 prefixes, from our infrastructure, even if you do not operate your own ASN.
• Experimental Peering: We welcome peering with other research or non-commercial ASes, either at IXPs or remotely via a WireGuard tunnel.

This support is aimed at helping individuals or organizations run Internet measurements, test BGP behavior, or build experimental services—without needing to operate their own global network.

Routing Policy

• Open peering policy: AS215011 welcomes peers at our IXPs or over tunneled sessions.
• RPKI enforcement: We perform RPKI validation and filter invalid routes, refreshing every 900 seconds.
• Geofeed: Our geolocation data is publicly available: geofeed.nxthdr.dev

You can view a list of current peers here: peers.nxthdr.dev

Transparency and Security

We embrace radical transparency. The full configuration of our AS215011 routers is openly available in our infrastructure repository.

If you identify a security issue or misconfiguration, you are encouraged to open an issue or submit a pull request, or contact us directly at admin@nxthdr.dev. We take security seriously and will work with you to resolve any issues promptly.