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Network
Resolve one ASN to the IP prefixes it announces.
overview
get-asn-prefixes accepts a single autonomous system number passed positionally and returns the CIDR prefixes that ASN announces. One ASN in, concrete address space out.
Those prefixes seed infrastructure mapping: expand to hosts, port-scan live addresses, probe answering services. The node stays narrow; it does not resolve orgs or expand hosts itself.
Trickest runs it as a managed Network node ahead of CIDR reshape and scanning. Feed an ASN from asnmap, then hand the prefix file to mapcidr, decant, or a port scanner.
use cases
Resolve a known ASN to the CIDR prefixes routed behind it, then treat those ranges as the in-scope boundary for the rest of the engagement.
Write the prefixes to a file and hand them to a CIDR expander and a port scanner so probing runs against the IP space the ASN announces.
Start from the ASN you resolved for a company and pull its prefixes to reveal the broader network it operates, including ranges no published hostname points at.
Run it per ASN across an organization's autonomous systems and collect the prefix files into a single picture of the address space it controls.
reference
| Name | Type | Flag | Description |
|---|---|---|---|
| asn | STRING | · | Autonomous system number to fetch announced IP prefixes for (passed positionally, for example AS64496). |
Showing key inputs. get-asn-prefixes exposes 1 inputs in total.
example
# get-asn-prefixes: list announced CIDRs for one ASNget-asn-prefixes AS64496192.0.2.0/24198.51.100.0/24198.51.100.0/25198.51.100.128/25203.0.113.0/24203.0.113.0/26203.0.113.64/26203.0.113.128/25guidance
Use when you already have an ASN and need the prefixes it announces. To resolve an org, domain, or IP to an ASN first, run asnmap. To slice or merge the prefixes once you have them, use mapcidr.
Resolves an org, domain, ASN, or IP to ranges. Run it ahead of this node when you only have a name, not a number.
Operates on CIDR ranges (split, merge, aggregate). Use it after this node to reshape the prefixes.
Expands CIDR ranges into individual IP addresses. Run it on the prefixes before host-level scanning.
faq
related
Map an organization's network ranges from ASN data.
Validate public DNS resolvers against trusted baselines.
Parallel ICMP echo sweeps for CIDR ranges and host files.
Probe a domain list for working HTTP and HTTPS servers.
A fast and multi-purpose HTTP toolkit that runs multiple probers with reliable, high-throughput results.
Expand, aggregate, and slice CIDR ranges into host lists.
An ASN feeds get-asn-prefixes, which pulls the announced CIDR blocks and passes them to mapcidr for cleanup before they land as a queryable prefixes output.
Facts on this page come from the live Trickest tool library.