# Perimeter

* <https://pentest-tools.com/home>
* <https://hackertarget.com/ip-tools/>
* DNS
  * `$ nslookup example.com`
  * Subdomains & AXFR
  * AS details
  * $ `whois example.com`
  * $ `whois 127.0.0.1`
  * Check for DNS Amplification
* CMS, Stack, Vulns
  * WhatWeb, Wappalyzer
  * Shodan / Censys / SecurityTrails
* Google Dorks
  * `/robots.txt`
  * `/sitemap.xml`

## Autonomous Systems

* <https://hackware.ru/?p=9245>

### Info via IP

dig:

```
$ dig $(dig -x 127.0.0.1 | grep PTR | tail -n 1 | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}').origin.asn.cymru.com TXT +short
```

whois:

```
$ whois -h whois.cymru.com -- '-v 127.0.0.1'
$ whois -h whois.radb.net 127.0.0.1
```

### Info via ASN

whois:

```
$ whois -h whois.cymru.com -- '-v AS48666'
$ whois -h whois.radb.net AS48666
```

### Search AS

* <https://radar.qrator.net/search?query=AS31337>
* <https://github.com/nitefood/asn>

Map IP addresses to AS by `origin` and `netname` ignoring potentionally unwanted `netname` values by keywords:

{% code title="whois.sh" %}

```bash
 #!/bin/bash
 # Usage: whois.sh ip_list.txt

for ip in `cat $1`; do
  WHOIS=`whois $ip`
  ASNUM=`echo $WHOIS | grep -i "origin:" | tr -d ' ' | cut -d ":" -f 2 | tr $'\n' ','`
  NETNAME=`echo $WHOIS | grep -i "netname:" | tr -d ' ' | cut -d ":" -f 2`
  if ! echo "$NETNAME" | grep -iqF -e pppoe -e ipoe; then
    echo "$ASNUM,$NETNAME,$ip"
   fi
done
```

{% endcode %}

One-liner providing the input from [DivideAndScan](https://github.com/snovvcrash/DivideAndScan):

```
$ for i in `das -db corp scan -ports all -show -raw | sort -u`; do whois $i | grep -e org-name: -e netname: -e route: -e origin:; echo ---; done
```

Using [ansmap](https://github.com/projectdiscovery/asnmap):

```
$ asnmap -i `das -db corp scan -ports all -show -raw | sort -u | sed -z 's/\n/,/g;s/,$/\n/'` -silent
$ asnmap -d `cat domains.txt | sed -z 's/\n/,/g;s/,$/\n/'` -silent
```

Difference between as-name, aut-num, origin, netname, etc. may be found on [RIPE](https://www.ripe.net/manage-ips-and-asns/db/support/documentation/ripe-database-documentation/@@fullbodyrecursive-view).


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