# Vault 7: Projects

This publication series is about specific projects related to the Vault 7 main publication.

### Grasshopper

# Grasshopper-v2_0_1-UserGuide

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SECRET//NOFORN
8.2 DNS Lookup
The “dns_lookup” verb states that the target can resolve the host and service
port. Grasshopper checks resolution by performing a DNS lookup.
Usage
network.dns_lookup(<host>, <port>)
host
Host name or IPv4 address
port
TCP port number
Truth Table
TRUE
Target can resolve service at host on port
FALSE
Target cannot resolve service at host on port
INVALID
Error occurred while attempting lookup
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