A fast and multi-purpose DNS toolkit designed for running DNS queries
Features •
Installation •
Usage •
Running `dnsx` •
Wildcard •
Notes •
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---
`dnsx` is a fast and multi-purpose DNS toolkit designed for running various probes through the [retryabledns](https://github.com/projectdiscovery/retryabledns) library. It supports multiple DNS queries, user supplied resolvers, DNS wildcard filtering like [shuffledns](https://github.com/projectdiscovery/shuffledns) etc.
# Features
- Simple and Handy utility to query DNS records.
- **A, AAAA, CNAME, PTR, NS, MX, TXT, SRV, SOA** query support
- DNS **Resolution** / **Brute-force** support
- Custom **resolver** input support
- Multiple resolver format **(TCP/UDP/DOH/DOT)** support
- **stdin** and **stdout** support
- Automatic **wildcard** handling support
# Installation Instructions
`dnsx` requires **go1.19** to install successfully. Run the following command to install the latest version:
```sh
go install -v github.com/projectdiscovery/dnsx/cmd/dnsx@latest
```
# Usage
```sh
dnsx -h
```
This will display help for the tool. Here are all the switches it supports.
```console
INPUT:
-l, -list string list of sub(domains)/hosts to resolve (file or stdin)
-d, -domain string list of domain to bruteforce (file or comma separated or stdin)
-w, -wordlist string list of words to bruteforce (file or comma separated or stdin)
QUERY:
-a query A record (default)
-aaaa query AAAA record
-cname query CNAME record
-ns query NS record
-txt query TXT record
-srv query SRV record
-ptr query PTR record
-mx query MX record
-soa query SOA record
-axfr query AXFR
-caa query CAA record
FILTER:
-re, -resp display dns response
-ro, -resp-only display dns response only
-rc, -rcode string filter result by dns status code (eg. -rcode noerror,servfail,refused)
PROBE:
-cdn display cdn name
-asn display host asn information
RATE-LIMIT:
-t, -threads int number of concurrent threads to use (default 100)
-rl, -rate-limit int number of dns request/second to make (disabled as default) (default -1)
UPDATE:
-up, -update update dnsx to latest version
-duc, -disable-update-check disable automatic dnsx update check
OUTPUT:
-o, -output string file to write output
-json write output in JSONL(ines) format
DEBUG:
-hc, -health-check run diagnostic check up
-silent display only results in the output
-v, -verbose display verbose output
-raw, -debug display raw dns response
-stats display stats of the running scan
-version display version of dnsx
OPTIMIZATION:
-retry int number of dns attempts to make (must be at least 1) (default 2)
-hf, -hostsfile use system host file
-trace perform dns tracing
-trace-max-recursion int Max recursion for dns trace (default 32767)
-resume resume existing scan
-stream stream mode (wordlist, wildcard, stats and stop/resume will be disabled)
CONFIGURATIONS:
-r, -resolver string list of resolvers to use (file or comma separated)
-wt, -wildcard-threshold int wildcard filter threshold (default 5)
-wd, -wildcard-domain string domain name for wildcard filtering (other flags will be ignored)
```
## Running dnsx
### DNS Resolving
Filter active hostnames from the list of passive subdomains, obtained from various sources:
```console
subfinder -silent -d hackerone.com | dnsx -silent
a.ns.hackerone.com
www.hackerone.com
api.hackerone.com
docs.hackerone.com
mta-sts.managed.hackerone.com
mta-sts.hackerone.com
resources.hackerone.com
b.ns.hackerone.com
mta-sts.forwarding.hackerone.com
events.hackerone.com
support.hackerone.com
```
Print **A** records for the given list of subdomains:
```console
subfinder -silent -d hackerone.com | dnsx -silent -a -resp
www.hackerone.com [104.16.100.52]
www.hackerone.com [104.16.99.52]
hackerone.com [104.16.99.52]
hackerone.com [104.16.100.52]
api.hackerone.com [104.16.99.52]
api.hackerone.com [104.16.100.52]
mta-sts.forwarding.hackerone.com [185.199.108.153]
mta-sts.forwarding.hackerone.com [185.199.109.153]
mta-sts.forwarding.hackerone.com [185.199.110.153]
mta-sts.forwarding.hackerone.com [185.199.111.153]
a.ns.hackerone.com [162.159.0.31]
resources.hackerone.com [52.60.160.16]
resources.hackerone.com [3.98.63.202]
resources.hackerone.com [52.60.165.183]
resources.hackerone.com [read.uberflip.com]
mta-sts.hackerone.com [185.199.110.153]
mta-sts.hackerone.com [185.199.111.153]
mta-sts.hackerone.com [185.199.109.153]
mta-sts.hackerone.com [185.199.108.153]
gslink.hackerone.com [13.35.210.17]
gslink.hackerone.com [13.35.210.38]
gslink.hackerone.com [13.35.210.83]
gslink.hackerone.com [13.35.210.19]
b.ns.hackerone.com [162.159.1.31]
docs.hackerone.com [185.199.109.153]
docs.hackerone.com [185.199.110.153]
docs.hackerone.com [185.199.111.153]
docs.hackerone.com [185.199.108.153]
support.hackerone.com [104.16.51.111]
support.hackerone.com [104.16.53.111]
mta-sts.managed.hackerone.com [185.199.108.153]
mta-sts.managed.hackerone.com [185.199.109.153]
mta-sts.managed.hackerone.com [185.199.110.153]
mta-sts.managed.hackerone.com [185.199.111.153]
```
Extract **A** records for the given list of subdomains:
```console
subfinder -silent -d hackerone.com | dnsx -silent -a -resp-only
104.16.99.52
104.16.100.52
162.159.1.31
104.16.99.52
104.16.100.52
185.199.110.153
185.199.111.153
185.199.108.153
185.199.109.153
104.16.99.52
104.16.100.52
104.16.51.111
104.16.53.111
185.199.108.153
185.199.111.153
185.199.110.153
185.199.111.153
```
Extract **CNAME** records for the given list of subdomains:
```console
subfinder -silent -d hackerone.com | dnsx -silent -cname -resp
support.hackerone.com [hackerone.zendesk.com]
resources.hackerone.com [read.uberflip.com]
mta-sts.hackerone.com [hacker0x01.github.io]
mta-sts.forwarding.hackerone.com [hacker0x01.github.io]
events.hackerone.com [whitelabel.bigmarker.com]
```
Extract **ASN** records for the given list of subdomains:
```console
subfinder -silent -d hackerone.com | dnsx -silent -asn
b.ns.hackerone.com [AS13335, CLOUDFLARENET, US]
a.ns.hackerone.com [AS13335, CLOUDFLARENET, US]
hackerone.com [AS13335, CLOUDFLARENET, US]
www.hackerone.com [AS13335, CLOUDFLARENET, US]
api.hackerone.com [AS13335, CLOUDFLARENET, US]
support.hackerone.com [AS13335, CLOUDFLARENET, US]
```
Probe using [dns status code](https://github.com/projectdiscovery/dnsx/wiki/RCODE-ID-VALUE-Mapping) on given list of (sub)domains:
```console
subfinder -silent -d hackerone.com | dnsx -silent -rcode noerror,servfail,refused
ns.hackerone.com [NOERROR]
a.ns.hackerone.com [NOERROR]
b.ns.hackerone.com [NOERROR]
support.hackerone.com [NOERROR]
resources.hackerone.com [NOERROR]
mta-sts.hackerone.com [NOERROR]
www.hackerone.com [NOERROR]
mta-sts.forwarding.hackerone.com [NOERROR]
docs.hackerone.com [NOERROR]
```
Extract subdomains from given network range using `PTR` query:
```console
echo 173.0.84.0/24 | dnsx -silent -resp-only -ptr
cors.api.paypal.com
trinityadminauth.paypal.com
cld-edge-origin-api.paypal.com
appmanagement.paypal.com
svcs.paypal.com
trinitypie-serv.paypal.com
ppn.paypal.com
pointofsale-new.paypal.com
pointofsale.paypal.com
slc-a-origin-pointofsale.paypal.com
fpdbs.paypal.com
```
Extract subdomains from given ASN using `PTR` query:
```console
echo AS17012 | dnsx -silent -resp-only -ptr
apiagw-a.paypal.com
notify.paypal.com
adnormserv-slc-a.paypal.com
a.sandbox.paypal.com
apps2.paypal-labs.com
pilot-payflowpro.paypal.com
www.paypallabs.com
paypal-portal.com
micropayments.paypal-labs.com
minicart.paypal-labs.com
```
---------
### DNS Bruteforce
Bruteforce subdomains for given domain or list of domains using `d` and `w` flag:
```console
dnsx -silent -d facebook.com -w dns_worldlist.txt
blog.facebook.com
booking.facebook.com
api.facebook.com
analytics.facebook.com
beta.facebook.com
apollo.facebook.com
ads.facebook.com
box.facebook.com
alpha.facebook.com
apps.facebook.com
connect.facebook.com
c.facebook.com
careers.facebook.com
code.facebook.com
```
Bruteforce targeted subdomain using single or multiple keyword input, as `d` or `w` flag supports file or comma separated keyword inputs:
```console
dnsx -silent -d domains.txt -w jira,grafana,jenkins
grafana.1688.com
grafana.8x8.vc
grafana.airmap.com
grafana.aerius.nl
jenkins.1688.com
jenkins.airbnb.app
jenkins.airmap.com
jenkins.ahn.nl
jenkins.achmea.nl
jira.amocrm.com
jira.amexgbt.com
jira.amitree.com
jira.arrival.com
jira.atlassian.net
jira.atlassian.com
```
Values are accepted from **stdin** for all the input types (`-list`, `-domain`, `-wordlist`). The `-list` flag defaults to `stdin`, but the same can be achieved for other input types by adding a `-` (dash) as parameter:
```console
cat domains.txt | dnsx -silent -w jira,grafana,jenkins -d -
grafana.1688.com
grafana.8x8.vc
grafana.airmap.com
grafana.aerius.nl
jenkins.1688.com
jenkins.airbnb.app
jenkins.airmap.com
jenkins.ahn.nl
jenkins.achmea.nl
jira.amocrm.com
jira.amexgbt.com
jira.amitree.com
jira.arrival.com
jira.atlassian.net
jira.atlassian.com
```
#### DNS Bruteforce with Placeholder based wordlist
```bash
$ cat tld.txt
com
by
de
be
al
bi
cg
dj
bs
```
```console
dnsx -d google.FUZZ -w tld.txt -resp
_ __ __
__| | _ __ ___ \ \/ /
/ _' || '_ \ / __| \ /
| (_| || | | |\__ \ / \
\__,_||_| |_||___//_/\_\ v1.1.2
projectdiscovery.io
google.de [142.250.194.99]
google.com [142.250.76.206]
google.be [172.217.27.163]
google.bs [142.251.42.35]
google.bi [216.58.196.67]
google.al [216.58.196.68]
google.by [142.250.195.4]
google.cg [142.250.183.131]
google.dj [142.250.192.3]
```
### Wildcard filtering
A special feature of `dnsx` is its ability to handle **multi-level DNS based wildcards**, and do it so with a very reduced number of DNS requests. Sometimes all the subdomains will resolve, which leads to lots of garbage in the output. The way `dnsx` handles this is by keeping track of how many subdomains point to an IP and if the count of the subdomains increase beyond a certain threshold, it will check for wildcards on all the levels of the hosts for that IP iteratively.
```console
dnsx -l subdomain_list.txt -wd airbnb.com -o output.txt
```
---------
### Dnsx as a library
It's possible to use the library directly in your golang programs. The following code snippets is an example of use in golang programs. Please refer to [here](https://pkg.go.dev/github.com/projectdiscovery/dnsx@v1.1.0/libs/dnsx) for detailed package configuration and usage.
```go
package main
import (
"fmt"
"github.com/projectdiscovery/dnsx/libs/dnsx"
)
func main() {
// Create DNS Resolver with default options
dnsClient, err := dnsx.New(dnsx.DefaultOptions)
if err != nil {
fmt.Printf("err: %v\n", err)
return
}
// DNS A question and returns corresponding IPs
result, err := dnsClient.Lookup("hackerone.com")
if err != nil {
fmt.Printf("err: %v\n", err)
return
}
for idx, msg := range result {
fmt.Printf("%d: %s\n", idx+1, msg)
}
// Query
rawResp, err := dnsClient.QueryOne("hackerone.com")
if err != nil {
fmt.Printf("err: %v\n", err)
return
}
fmt.Printf("rawResp: %v\n", rawResp)
jsonStr, err := rawResp.JSON()
if err != nil {
fmt.Printf("err: %v\n", err)
return
}
fmt.Println(jsonStr)
return
}
```
# 📋 Notes
- As default, `dnsx` checks for **A** record.
- As default `dnsx` uses Google, Cloudflare, Quad9 [resolver](https://github.com/projectdiscovery/dnsx/blob/43af78839e237ea8cbafe571df1ab0d6cbe7f445/libs/dnsx/dnsx.go#L31).
- Custom resolver list can be loaded using the `r` flag.
- Domain name (`wd`) input is mandatory for wildcard elimination.
- DNS record flag can not be used when using wildcard filtering.
- DNS resolution (`l`) and DNS brute-forcing (`w`) can't be used together.
- VPN operators tend to filter high DNS/UDP traffic, therefore the tool might experience packets loss (eg. [Mullvad VPN](https://github.com/projectdiscovery/dnsx/issues/221))
`dnsx` is made with 🖤 by the [projectdiscovery](https://projectdiscovery.io) team.