IPv4 Measurement Research

Building an interactive map of the IPv4 Internet.

You likely arrived here because you saw ICMP echo requests (pings) from an IP address operated by sculk.ltd. This page explains what the activity is and how to exclude your network from future probes.

What we are doing

We send lightweight, non-intrusive ICMP echo requests over IPv4 to the public IPv4 address space. The data is used for a single purpose: to build an interactive map of the IPv4 Internet that visualizes reachability and address-space utilization for scientific and educational use. Only IPv4 is probed — we do not currently scan IPv6.

What we are not doing

• We do not attempt to log into, exploit, or interact with services on your hosts.
• We do not perform port scans, vulnerability scans, or application-layer probing as part of this activity.
• We do not collect personal data. Only protocol-level response characteristics are recorded.
• We do not sell or share raw measurement data with third parties.

Why ICMP?

ICMP echo (ping) is one of the lowest-impact tools available for measuring Internet reachability. A typical probe is a single small packet and adds negligible load on any properly functioning host or network device. Recording only whether an address responds is exactly what is needed to plot it on the map — no payload inspection or higher-layer probing is performed.

Opting out

Opt-out requests are processed manually and typically take effect within a few business days. Once added, the listed ranges are excluded from all of our active measurement campaigns. Please send the request from an address that can be tied to the network in question (for example, an address listed in WHOIS / RIR records or an abuse contact for the prefix).

Abuse and other inquiries

For abuse reports, research collaboration questions, or any other concerns, the same address — support@sculk.ltd — is monitored and we aim to respond promptly.