zl4kj.nz:23

Connection Banner:

Server URLs

zl4kj.nz:23
Website: 135-129-91-121.res.trstrm.net

Server Location: 🇳🇿 New Zealand (GeoIP)

Listing

BBS Name: Crystal Set (from listing)
Listed Location: Invercargill, , New Zealand

BBS Software

Detected: Synchronet

Encoding

Effective encoding: cp437
Scanner detected: ascii

Telnet Fingerprint

d06e080c36c73c6a

This fingerprint is shared by 24 other servers.

Options offered by server: AARDWOLF, ATCP, BINARY, CHARSET, COM_PORT, ECHO, EOR, GMCP, MSDP, MSP, MSSP, MXP, SGA, STATUS, ZMP

Options requested from client: NAWS, NEW_ENVIRON, TSPEED, TTYPE

The complete JSON record collected during the scan, including Telnet negotiation results and banner data.

Show JSON

{
  "server-probe": {
    "fingerprint": "d06e080c36c73c6a",
    "fingerprint-data": {
      "offered-options": [
        "AARDWOLF",
        "ATCP",
        "BINARY",
        "CHARSET",
        "COM_PORT",
        "ECHO",
        "EOR",
        "GMCP",
        "MSDP",
        "MSP",
        "MSSP",
        "MXP",
        "SGA",
        "STATUS",
        "ZMP"
      ],
      "probed-protocol": "server",
      "refused-options": [],
      "requested-options": [
        "NAWS",
        "NEW_ENVIRON",
        "TSPEED",
        "TTYPE"
      ],
      "scan-type": "quick"
    },
    "session_data": {
      "banner_after_return": "\r\n\r\n\u001b[0;37;40m\u001b[1m\u001b[36mEnter \u001b[37mUser Name\u001b[36m or \u001b[37mNumber\u001b[36m or '\u001b[33mNew\u001b[36m' or '\u001b[33mGuest\u001b[36m'\r\nLogin: \u001b[37m",
      "banner_before_return": "\r\nSynchronet BBS for Linux  Version 3.21\r\nTelnet connection from: 135.129.91.121\r\nResolving hostname...\r\n\r\n\u001b[s\u001b[0c\u001b[255B\u001b[255C\b_\u001b[6n\u001b[u\u001b[!_\r\udcef\udcbb\udcbf\u001b[6n\u001b[0m_\u001b[2J\u001b[H\f\r\r      Synchronet BBS for Linux  Version 3.21  Copyright 2025 Rob Swindell\r\n\u001b[37;40m  \u001b[1m\u001b[34m\udce2\udc95\udc94\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc97\u001b[5C\udce2\udc95\udc94\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc97\u001b[0;37;40m ANT\r\n  \u001b[1m\u001b[34m\udce2\udc95\udc91\u001b[32mo=------->\u001b[34m  \udce2\udc95\udc91\u001b[5C\udce2\udc95\udc91\u001b[32m\udce2\udc96\udc91\udce2\udc96\udc91\u001b[34m\udce2\udc95\udc91\u001b[0;37;40m GND\r\n  \u001b[1m\u001b[34m\udce2\udc95\udc9a\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc9d\u001b[5C\udce2\udc95\udc9a\udce2\udc95\udc90\udce2\udc95\udc90\udce2\udc95\udc9d\r\n\u001b[0;37;40m  \u001b[1m\u001b[34m[\u001b[0;37;40m \u001b[1m\u001b[33mFine Tune \u001b[34m]\u001b[4C\u001b[37mThe Crystal Set\r\n\u001b[34m\udce2\udc94\udc8c\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc90\r\n\udce2\udc94\udc82\u001b[0;37;40m \u001b[1m\u001b[32m\\\udce2\udc96\udc91/\u001b[0;37;40m  \u001b[1m\u001b[33mMODE: \u001b[34m[\u001b[30mAM\u001b[34m]\u001b[3C[\u001b[32mLSB\u001b[34m]\u001b[0;37;40m  \u001b[1m\u001b[34m[\u001b[30mUSB\u001b[34m]\u001b[0;37;40m  \u001b[1m\u001b[34m \u001b[0;37;40m \u001b[1m\u001b[34m\udce2\udc94\udc82\r\n\udce2\udc94\udc82\u001b[0;37;40m  \u001b[1m\u001b[32m\udce2\udc96\udc91\u001b[4C\u001b[33mPWR:\u001b[0;37;40m \u001b[1m\u001b[34m[\u001b[32m\udce2\udc96\udc92\u001b[34m]\u001b[0;37;40m \u001b[1m\u001b[33mLO\u001b[3C\u001b[34m[\u001b[30m\udce2\udc96\udc88\u001b[34m]\u001b[0;37;40m \u001b[1m\u001b[33mHI\u001b[8C\u001b[34m\udce2\udc94\udc82\r\n\udce2\udc94\udc94\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc80\udce2\udc94\udc98\u001b[0;37;40m\r\n\u001b[1mCLIENT \u001b[0;37;40m\u001b[36mCONN: \u001b[1mTelnet\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mADDR: \u001b[1m135-129-91-121.res.trstrm.net [135.129.91.121]\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mTERM: \u001b[1m80x25 UTF-8 / ANSI\r\n\u001b[0;37;40m\u001b[1mSERVER \u001b[0;37;40m\u001b[36mNAME: \u001b[1m\u001b[33mThe Crystal Set\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mADDR: \u001b[1mzl4kj.nz\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mNODE: \u001b[1m1 \u001b[0;37;40m\u001b[36m(of \u001b[1m10\u001b[0;37;40m\u001b[36m) - \u001b[1mArch Linux x86_64\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mTIME: \u001b[1mFri Feb 13 2026 09:28:40 NZDT\r\n\u001b[0;37;40m\u001b[1m       \u001b[0;37;40m\u001b[36mADMN: \u001b[1mZL4KJ\r\n\r\n\u001b[34mIf you are a new user to the system, type \u001b[36m\"New\"\u001b[34m now.\r\nOtherwise, enter your user name or number now.\r\n\u001b[0;37;40m\r\n\u001b[1m\u001b[36mEnter \u001b[37mUser Name\u001b[36m or \u001b[37mNumber\u001b[36m or '\u001b[33mNew\u001b[36m' or '\u001b[33mGuest\u001b[36m'\r\nLogin: \u001b[37m",
      "encoding": "ascii",
      "option_states": {
        "server_offered": {
          "ECHO": true,
          "SGA": true
        },
        "server_requested": {
          "NAWS": true,
          "NEW_ENVIRON": true,
          "SNDLOC": false,
          "TSPEED": true,
          "TTYPE": true
        }
      },
      "scan_type": "quick",
      "timing": {
        "probe": 0.2532961368560791,
        "total": 7.031989812850952
      }
    }
  },
  "sessions": [
    {
      "connected": "2026-02-12T20:28:45.129293+00:00",
      "host": "zl4kj.nz",
      "ip": "203.94.34.126",
      "port": 23
    }
  ]
}

Connection Log

Debug-level log of the Telnet negotiation session, showing each IAC (Interpret As Command) exchange between client and server.

Generated by telnetlib3-fingerprint

telnetlib3-fingerprint --loglevel=debug zl4kj.nz 23

Show Logfile

DEBUG client.py:1193 Fingerprint client: host=zl4kj.nz port=23
ERROR client.py:1296 zl4kj.nz:23: TCP connection to zl4kj.nz:23 timed out after 30.0s