base on Small, fast tool for performing reverse DNS lookups en masse. # hakrevdns Small, fast, simple tool for performing reverse DNS lookups en masse. You feed it IP addresses, it returns hostnames. This can be a useful way of finding domains and subdomains belonging to a company from their IP addresses. ## Installation ```sh go install github.com/hakluke/hakrevdns@latest ``` ## Usage The most basic usage is to simply pipe a list of IP addresses into the tool, for example: ```sh hakluke~$ prips 173.0.84.0/24 | hakrevdns 173.0.84.110 he.paypal.com. 173.0.84.109 twofasapi.paypal.com. 173.0.84.114 www-carrier.paypal.com. 173.0.84.77 twofasapi.paypal.com. 173.0.84.102 pointofsale.paypal.com. 173.0.84.104 slc-a-origin-pointofsale.paypal.com. 173.0.84.111 smsapi.paypal.com. 173.0.84.203 m.paypal.com. 173.0.84.105 prm.paypal.com. 173.0.84.113 mpltapi.paypal.com. 173.0.84.8 ipnpb.paypal.com. 173.0.84.2 active-www.paypal.com. 173.0.84.4 securepayments.paypal.com. ... ``` ### Parameters ```sh hakluke~$ hakrevdns -h Usage: main [OPTIONS] Application Options: -t, --threads= How many threads should be used (default: 8) -r, --resolver= IP of the DNS resolver to use for lookups -R, --resolvers-file= File containing list of DNS resolvers to use for lookups -U, --use-default Use default resolvers for lookups -P, --protocol=[tcp|udp] Protocol to use for lookups (default: udp) -p, --port= Port to bother the specified DNS resolver on (default: 53) -d, --domain Output only domains -h, --help Show help message Help Options: -h, --help Show this help message ``` ### New Flags -U, --use-default: When specified, this flag tells the program to use a predefined list of default DNS resolvers for lookups. This is useful for ensuring consistent DNS resolution across various environments, especially if no custom resolvers are provided. -R, --resolvers-file: This flag allows you to specify a file containing a list of custom DNS resolvers. Each line in the file should contain a single resolver IP address. If both -R and -r are provided, the resolver specified by -r is added to the list of resolvers from the file. If you want to use a resolver not specified by your OS, say: 1.1.1.1, try this: ```sh hakluke~$ echo "173.0.84.110" | hakrevdns -r 1.1.1.1 173.0.84.110 he.paypal.com. ``` If you wish to obtain only a list of domains without IP addresses, you can use `-d`: ```sh $ echo "173.0.84.110" | hakrevdns -d ``` This tool is designed to be easily piped into other tools, for example: ```sh $ echo "173.0.84.110" | hakrevdns -d | httprobe ``` ## Contributors - [hakluke](https://twitter.com/hakluke) wrote the tool - [alphakilo](https://github.com/Alphakilo/) added the option to use custom resolvers - [SaveBreach](https://twitter.com/SaveBreach/) added the -d flag and cleaned up the code ", Assign "at most 3 tags" to the expected json: {"id":"5895","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"