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IPv4 subnets vs. ASN grouping
import { readFile } from "fs/promises";
import { Reader } from '@maxmind/geoip2-node';
const anonymize = true;
const ipaddresses = (await readFile("ipaddresses.csv", "utf8")).split("\n");
const countsPerASN: Map<number, number> = new Map();
const reader = await Reader.open("./GeoLite2-ASN.mmdb");
for (const ipstr of ipaddresses) {
const ASN = reader.asn(ipstr).autonomousSystemNumber!;
if(ASN)
countsPerASN.set(ASN, (countsPerASN.get(ASN) ?? 0) + 1);
else
console.warn(`No ASN for ${ipstr}`);
}
console.log("ASN,Count");
let i = 0;
for (const [ASN, count] of countsPerASN.entries()) {
console.log(`${!anonymize ? `AS${ASN}` : `AS${++i}`},${count}`);
}
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}
{
"type": "module",
"scripts": {
"subnets": "tsx subnets.ts",
"asn": "tsx asn.ts"
},
"devDependencies": {
"@types/node": "^18.11.18",
"tsx": "^3.12.1"
},
"dependencies": {
"@maxmind/geoip2-node": "^3.5.0"
}
}
import { readFile } from "fs/promises";
const anonymize = true;
const ipaddresses = (await readFile("ipaddresses.csv", "utf8")).split("\n");
const countsPerSubnet: Map<string, number> = new Map();
for (const ipstr of ipaddresses) {
const splits = ipstr.split(".");
splits[3] = "0/24";
const subnet = splits.join(".");
countsPerSubnet.set(subnet, (countsPerSubnet.get(subnet) ?? 0) + 1);
}
console.log("Subnet,Count");
let i = 0;
for (const [subnet, count] of countsPerSubnet.entries()) {
console.log(`${!anonymize ? subnet : `/24 ${++i}`},${count}`);
}
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