Sometimes I come across an IP address, for example when reviewing logs. And I'd like to find out more about this numerical label. Checkip is CLI tool and Go library that provides infomation on and security posture of IP addresses. Most checks are passive and active checks (like ping and tls) are not aggressive.
go install github.com/jreisinger/checkip@latest
checkip 1.1.1.1
Check an IP address:
❯ checkip 91.228.166.47
--- 91.228.166.47 ---
db-ip.com Petržalka, Slovakia
dns name skh1-webredir01-v.eset.com
iptoasn.com ESET-AS
is on AWS false
isc.sans.edu attacks: 0, abuse contact: [email protected]
ping 100% packet loss (5/0), avg round-trip 0 ms
tls TLS 1.3, exp. 2024/01/02!!, www.eset.com, eset.com
malicious prob. 8% (1/12) ✅
Check multiple IP addresses coming from STDIN:
❯ dig +short eset.sk | checkip
--- 91.228.167.128 ---
db-ip.com Petržalka, Slovakia
dns name h3-webredir02-v.eset.com
iptoasn.com ESET-AS
is on AWS false
isc.sans.edu attacks: 0, abuse contact: [email protected]
ping 100% packet loss (5/0), avg round-trip 0 ms
tls TLS 1.3, exp. 2024/01/02!!, www.eset.com, eset.com
malicious prob. 9% (1/11) ✅
--- 91.228.166.47 ---
db-ip.com Petržalka, Slovakia
dns name skh1-webredir01-v.eset.com
iptoasn.com ESET-AS
is on AWS false
isc.sans.edu attacks: 0, abuse contact: [email protected]
ping 100% packet loss (5/0), avg round-trip 0 ms
tls TLS 1.3, exp. 2024/01/02!!, www.eset.com, eset.com
malicious prob. 8% (1/12) ✅
Use detailed JSON output to filter out those checks that consider the IP address to be malicious:
❯ checkip -j 91.228.166.47 | jq '.checks[] | select(.ipAddrIsMalicious == true)'
{
"description": "tls",
"type": "InfoAndIsMalicious",
"ipAddrIsMalicious": true,
"ipAddrInfo": {
"SAN": [
"www.eset.com",
"eset.com"
],
"Version": 772,
"Expiry": "2024-01-02T23:59:59Z"
}
}
Continuously generate random IP addresses and check them (hit Ctrl-C to stop):
❯ while true; do ./randip; sleep 2; done | checkip 2> /dev/null
--- 155.186.85.125 ---
db-ip.com Ashburn, United States
dns name syn-155-186-085-125.res.spectrum.com
iptoasn.com CHARTER-20115
is on AWS false
isc.sans.edu attacks: 0, abuse contact: [email protected]
ping 100% packet loss (5/0), avg round-trip 0 ms
malicious prob. 0% (0/10) ✅
--- 115.159.53.216 ---
db-ip.com Shenzhen (Futian Qu), China
iptoasn.com TENCENT-NET-AP Shenzhen Tencent Computer Systems Company Limited
is on AWS false
isc.sans.edu attacks: 0, abuse contact: [email protected]
ping 100% packet loss (5/0), avg round-trip 0 ms
malicious prob. 0% (0/10) ✅
Generate 100 random IP addresses and select Russian or Chinese:
❯ ./randip 100 | checkip -p 20 -j 2> /dev/null | jq -r '.ipAddr as $ip | .checks[] | select (.description == "db-ip.com" and (.ipAddrInfo.iso_code == "RU" or .ipAddrInfo.iso_code == "CN")) | $ip'
218.19.226.129
119.32.13.38
139.210.45.205
Find out who is trying to SSH into your Linux system:
❯ sudo journalctl --unit ssh --since "1 hour ago" | \
∙ grep 'Bye Bye' | perl -wlne '/from ([\d\.]+)/ && print $1' | sort | uniq | \
∙ checkip 2> /dev/null
--- 167.172.105.64 ---
db-ip.com Frankfurt am Main, Germany
iptoasn.com DIGITALOCEAN-ASN
ping 0% packet loss (5/5), avg round-trip 21 ms
tls TLS 1.3, exp. 2024/12/27, portal.itruck.com.sa, www.portal.itruck.com.sa
malicious prob. 43% (3/7) 🤏
--- 180.168.95.234 ---
db-ip.com Shanghai, China
iptoasn.com CHINANET-SH-AP China Telecom Group
ping 0% packet loss (5/5), avg round-trip 213 ms
malicious prob. 50% (3/6) 🚫
To install the CLI tool
# optional; to install inside a container
docker run --rm -it golang /bin/bash
go install github.com/jreisinger/checkip@latest
or download a release binary (from under "Assets") for your system and architecture.
For some checks to start working you need to register and get an API (LICENSE) key. See the service web site for how to do that. An absent key is not reported as an error, the check is simply not executed and missingCredentials JSON field is set.
Store the keys in $HOME/.checkip.yaml file:
ABUSEIPDB_API_KEY: aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffff11111111222222223333333344444444
MAXMIND_LICENSE_KEY: abcdef1234567890
SHODAN_API_KEY: aaaabbbbccccddddeeeeffff11112222
URLSCAN_API_KEY: abcd1234-a123-4567-678z-a2b3c4b5d6e7
VIRUSTOTAL_API_KEY: aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffff1111111122222222
You can also use environment variables with the same names.
Data used by some checks are downloaded (cached) to $HOME/.checkip/ folder. They are periodically re-downloaded so they are fresh.
Checkip is easy to extend. If you want to add a new way of checking IP addresses:
- Write a function of type check.Func.
- Add it to check.Funcs variable.
Typical workflow:
make run # test and run
git commit
git tag | sort -V | tail -1
git tag -a v0.2.0 -m "new check func"
git push --follow-tags # will build a new release on GitHub
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