Neatbo.

Explain declared route selection

Compare a declared IPv4/IPv6 route table against destinations; retain longest-prefix and metric decisions, equal-rank candidates, terminal actions and every comparison.

Browser-local processingInputDeclared route JSONOutputFull report, CSV and originalUp to 10 MiB per file · File limit: 1

Manually structure one static table from native route text. The tool explains the declared ranking; cache, redirects and live policy require actual system review.

Declared routes and destinations JSON

Only the selected source for this role is processed. The file is read after its name and combined size pass the checks; inactive sources remain unused.

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No result yet

Before you start

Compare a declared IPv4/IPv6 route table against destinations; retain longest-prefix and metric decisions, equal-rank candidates, terminal actions and every comparison.

How to use this tool

  1. Choose paste or file mode.
  2. Provide declared routes and destinations.
  3. Inspect every comparison and all equal-rank candidates.
  4. Download originals and full JSON/CSV before checking actual system state.

Supported inputs and limits

Explicit paste or one UTF-8 JSON file mode; only the selected mode is processed. Raw input is at most 1 MiB. BOM, malformed UTF-8, duplicate keys and lossy numbers refuse.

1–4096 routes and 1–256 destinations; their product is at most 16384. id/interface use 1–128 UTF-16 units; metric is an integer 0–4294967295 and hopLimit an integer 0–255.

unicast, blackhole, unreachable and prohibit are supported. A unicast nextHop must have the same family. CIDR host-bit normalization is recorded; IPv4-mapped IPv6 stays IPv6.

Rank by longest prefix, then lowest metric. Keep every equal-rank candidate; order and hopLimit never resolve a tie. Mixed terminal actions remain explicit.

All complete JSON, CSV, original and copy text total at most 16 MiB. CSV prefixes formula-leading cells with an apostrophe; JSON and original preserve values. Over-budget work refuses atomically.

The declared table omits actual policy, cache, redirects, interface state and packet-level ECMP. It cannot establish or repair a live packet path.

Native route text requires manual structuring into the declared JSON fields. This tool reads one static table and cannot repair a live route, cache, redirect or policy.

Only the active paste/file source is processed. Active filenames allow 512 UTF-8 bytes and MIME labels 128; strict byte-exact originals and provenance SHA256 remain downloadable.

A whole 10-second absolute deadline starts before metadata validation and native file reading and continues through Worker loading and publication. Cancel, timeout or a source change clears every old artifact; retain the same complete source to rerun.

Complete JSON report, formula-safe CSV, original and copy total 16 MiB. Output sizes are reserved before large serialization; typed report/table JSON has a separate 16 MiB work cap. No partial output is published.

Worked example

Example input

{"routes":[{"id":"=default","cidr":"10.0.0.1/0","metric":100,"type":"unicast","nextHop":"10.0.0.1","interface":"网卡😀","hopLimit":64},{"id":"local","cidr":"10.0.0.0/24","metric":1,"type":"unicast"},{"id":"blocked","cidr":"2001:db8::/32","metric":0,"type":"blackhole"}],"destinations":["10.0.0.2","2001:db8::1","192.0.2.1"]}
Example options
{"sourceMode":"paste"}

Example output

{
  "schema": "neatbo-static-routes/1",
  "model": "single-declared-table-longest-prefix-then-lowest-unsigned-metric",
  "routeCount": 3,
  "destinationCount": 3,
  "comparisonCount": 9,
  "routes": [
    {
      "index": 0,
      "id": "=default",
      "source": {
        "id": "=default",
        "cidr": "10.0.0.1/0",
        "metric": 100,
        "type": "unicast",
        "nextHop": "10.0.0.1",
        "interface": "网卡😀",
        "hopLimit": 64
      },
      "family": "ipv4",
      "network": "0.0.0.0",
      "prefix": 0,
      "cidr": "0.0.0.0/0",
      "hostBitsNormalized": true,
      "metric": 100,
      "type": "unicast",
      "nextHop": "10.0.0.1",
      "interface": "网卡😀",
      "hopLimit": 64
    },
    {
      "index": 1,
      "id": "local",
      "source": {
        "id": "local",
        "cidr": "10.0.0.0/24",
        "metric": 1,
        "type": "unicast"
      },
      "family": "ipv4",
      "network": "10.0.0.0",
      "prefix": 24,
      "cidr": "10.0.0.0/24",
      "hostBitsNormalized": false,
      "metric": 1,
      "type": "unicast",
      "nextHop": null,
      "interface": null,
      "hopLimit": null
    },
    {
      "index": 2,
      "id": "blocked",
      "source": {
        "id": "blocked",
        "cidr": "2001:db8::/32",
        "metric": 0,
        "type": "blackhole"
      },
      "family": "ipv6",
      "network": "2001:db8::",
      "prefix": 32,
      "cidr": "2001:db8::/32",
      "hostBitsNormalized": false,
      "metric": 0,
      "type": "blackhole",
      "nextHop": null,
      "interface": null,
      "hopLimit": null
    }
  ],
  "results": [
    {
      "index": 0,
      "source": "10.0.0.2",
      "family": "ipv4",
      "canonical": "10.0.0.2",
      "bestPrefix": 24,
      "bestMetric": 1,
      "decision": "forward",
      "tie": false,
      "selectedRouteIndexes": [
        1
      ],
      "comparisons": [
        {
          "routeIndex": 0,
          "id": "=default",
          "matched": true,
          "selected": false,
          "reason": "shorter-prefix"
        },
        {
          "routeIndex": 1,
          "id": "local",
          "matched": true,
          "selected": true,
          "reason": "best-prefix-and-metric"
        },
        {
          "routeIndex": 2,
          "id": "blocked",
          "matched": false,
          "selected": false,
          "reason": "different-family"
        }
      ]
    },
    {
      "index": 1,
      "source": "2001:db8::1",
      "family": "ipv6",
      "canonical": "2001:db8::1",
      "bestPrefix": 32,
      "bestMetric": 0,
      "decision": "blackhole",
      "tie": false,
      "selectedRouteIndexes": [
        2
      ],
      "comparisons": [
        {
          "routeIndex": 0,
          "id": "=default",
          "matched": false,
          "selected": false,
          "reason": "different-family"
        },
        {
          "routeIndex": 1,
          "id": "local",
          "matched": false,
          "selected": false,
          "reason": "different-family"
        },
        {
          "routeIndex": 2,
          "id": "blocked",
          "matched": true,
          "selected": true,
          "reason": "best-prefix-and-metric"
        }
      ]
    },
    {
      "index": 2,
      "source": "192.0.2.1",
      "family": "ipv4",
      "canonical": "192.0.2.1",
      "bestPrefix": 0,
      "bestMetric": 100,
      "decision": "forward",
      "tie": false,
      "selectedRouteIndexes": [
        0
      ],
      "comparisons": [
        {
          "routeIndex": 0,
          "id": "=default",
          "matched": true,
          "selected": true,
          "reason": "best-prefix-and-metric"
        },
        {
          "routeIndex": 1,
          "id": "local",
          "matched": false,
          "selected": false,
          "reason": "outside-prefix"
        },
        {
          "routeIndex": 2,
          "id": "blocked",
          "matched": false,
          "selected": false,
          "reason": "different-family"
        }
      ]
    }
  ],
  "sourceInputs": [
    {
      "role": "routes",
      "kind": "paste",
      "name": "routes-pasted.json",
      "mime": "application/json",
      "bytes": 329,
      "sha256": "8317ee00408584deebeffc4a20b9de2c0cab7cdd0e21f9790aebdc07ce730795"
    }
  ],
  "inputBytes": 329,
  "sourceCount": 1
}

When something does not work

Keep the original declaration; correct addresses, fields or value ranges. Split destinations if the budget is exceeded. No partial report is delivered after failure or cancellation; retry the same input.

Frequently asked questions

Does hopLimit change ranking?

No. It is retained as an attribute but is not a ranking key in this model.

Is the first equal-rank route chosen?

No. All equal-rank candidates and action ambiguity remain; packet selection needs actual-system information.

Documentation & further reading

Inspect a declared route table completely →A route tie should preserve uncertainty →

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