Domain, IP & ASN lookup.

{
    "rdapConformance": [
        "nro_rdap_profile_0",
        "cidr0",
        "rdap_level_0"
    ],
    "notices": [
        {
            "title": "Source",
            "description": [
                "Objects returned came from source",
                "TWNIC"
            ]
        },
        {
            "title": "Terms and Conditions",
            "description": [
                "This is the APNIC WHOIS Database query service. The objects are in RDAP format.",
                "This information has been partially mirrored by APNIC from TWNIC. To obtain more specific information, please use the TWNIC whois server at whois.twnic.net."
            ],
            "links": [
                {
                    "value": "https://twnic.rdap.apnic.net/ip/140.131.255.255",
                    "rel": "terms-of-service",
                    "href": "http://www.apnic.net/db/dbcopyright.html",
                    "type": "text/html"
                }
            ]
        },
        {
            "title": "Whois Inaccuracy Reporting",
            "description": [
                "If you see inaccuracies in the results, please visit: "
            ],
            "links": [
                {
                    "value": "https://twnic.rdap.apnic.net/ip/140.131.255.255",
                    "rel": "inaccuracy-report",
                    "href": "https://www.apnic.net/manage-ip/using-whois/abuse-and-spamming/invalid-contact-form",
                    "type": "text/html"
                }
            ]
        }
    ],
    "country": "TW",
    "name": "T-TP1RC.EDU.TW-NET",
    "status": [
        "active"
    ],
    "links": [
        {
            "value": "https://twnic.rdap.apnic.net/ip/140.131.255.255",
            "rel": "self",
            "href": "https://twnic.rdap.apnic.net/ip/140.131.0.0/16",
            "type": "application/rdap+json"
        }
    ],
    "remarks": [
        {
            "description": [
                "TANet Taipei NTU Regional Network",
                "No. 1, Sec. 4, Roosevelot Road",
                "Taipei Taiwan"
            ],
            "title": "description"
        },
        {
            "description": [
                "This information has been partially mirrored by APNIC from",
                "TWNIC. To obtain more specific information, please use the",
                "TWNIC whois server at whois.twnic.net."
            ],
            "title": "remarks"
        }
    ],
    "entities": [
        {
            "roles": [
                "technical",
                "administrative"
            ],
            "links": [
                {
                    "value": "https://twnic.rdap.apnic.net/ip/140.131.255.255",
                    "rel": "self",
                    "href": "https://twnic.rdap.apnic.net/entity/AN187-TW",
                    "type": "application/rdap+json"
                }
            ],
            "remarks": [
                {
                    "description": [
                        "This information has been partially mirrored by APNIC from",
                        "TWNIC. To obtain more specific information, please use the",
                        "TWNIC whois server at whois.twnic.net."
                    ],
                    "title": "remarks"
                }
            ],
            "handle": "AN187-TW",
            "objectClassName": "entity",
            "vcardArray": [
                "vcard",
                [
                    [
                        "version",
                        [],
                        "text",
                        "4.0"
                    ],
                    [
                        "fn",
                        [],
                        "text",
                        "ADMIN NTU"
                    ],
                    [
                        "kind",
                        [],
                        "text",
                        "individual"
                    ],
                    [
                        "adr",
                        {
                            "label": "National Taiwan University\nNo. 1, Sec. 4, Roosevelt Road\nTaipei Taiwan"
                        },
                        "text",
                        [
                            "",
                            "",
                            "",
                            "",
                            "",
                            "",
                            ""
                        ]
                    ],
                    [
                        "tel",
                        {
                            "type": "voice"
                        },
                        "text",
                        "+886-2-3366-5006"
                    ],
                    [
                        "tel",
                        {
                            "type": "fax"
                        },
                        "text",
                        "+886-2-2363-7204"
                    ],
                    [
                        "email",
                        [],
                        "text",
                        "abuse@ntu.edu.tw"
                    ]
                ]
            ]
        }
    ],
    "handle": "140.131.0.0 - 140.131.255.255",
    "type": "ASSIGNED NON-PORTABLE",
    "startAddress": "140.131.0.0",
    "endAddress": "140.131.255.255",
    "objectClassName": "ip network",
    "ipVersion": "v4",
    "cidr0_cidrs": [
        {
            "v4prefix": "140.131.0.0",
            "length": 16
        }
    ],
    "port43": "whois.apnic.net"
}