WHOIS and RDAP show the legal entity that registered the IP block, which may be the parent company rather than the brand you know. Jio's blocks are registered to "Reliance Jio Infocomm Ltd" (a Reliance Industries subsidiary). Airtel's to "Bharti Airtel Ltd." For resellers — if your internet comes through a local ISP that resells Airtel or BSNL bandwidth, the lookup will show Airtel or BSNL as the ISP, not the local reseller, because Airtel/BSNL owns the IP block. Additionally, if you are using a VPN, the lookup will show the VPN provider's ISP, not your actual home ISP.

An Autonomous System Number (ASN) is a globally unique 16-bit or 32-bit number assigned by a Regional Internet Registry (RIR) to a network that has a distinct routing policy on the internet. Every ISP, cloud provider, and large corporation managing its own internet presence has at least one ASN. The ASN matters because: (1) BGP routing — the internet routes packets based on AS-level path selections; (2) Abuse reporting — abuse complaints should be sent to the abuse contact registered with the ASN's RIR; (3) Traffic analysis — identifying that traffic comes from AS13335 (Cloudflare) vs AS55836 (Jio) tells you whether it's CDN traffic vs residential; (4) Security — threat intelligence feeds often block or flag entire ASNs known for hosting malicious infrastructure.

ISP lookup accuracy depends on the freshness of registration data. RDAP/WHOIS data is authoritative but can lag behind real-world routing changes by days or weeks. Common inaccuracies: (1) Sub-allocated blocks — an ISP may allocate a sub-range to a corporate customer, but WHOIS still shows the ISP as the owner until the sub-allocation is registered separately. (2) IP transfer — when companies buy IP blocks, WHOIS may not be immediately updated. (3) CGNAT — a Jio 4G user appears as "Reliance Jio" but they share the IP with thousands of others — you cannot identify the individual. (4) VPNs — a user on a VPN appears as the VPN provider's ISP. For the highest accuracy, combine RDAP/WHOIS data with BGP routing table data from sources like RIPE STAT or BGP.he.net.

No — an IP to ISP lookup only reveals the organisation that owns the IP address range. It does NOT identify the individual subscriber. The subscriber-to-IP mapping is held privately by the ISP and is only disclosed to law enforcement with a valid legal order (court order, subpoena, or in India, a request under the IT Act). On CGNAT networks like Jio 4G, a single IP may be shared among thousands of users simultaneously — making individual identification impossible even for the ISP without timestamp correlation. The ISP lookup is appropriate for network security purposes (identifying whether traffic comes from a residential ISP, datacenter, or VPN) but cannot identify any individual person.

The abuse contact is the email address or role registered with the ISP in WHOIS under the "abuse-c" field. To report abuse from an IP: (1) Look up the abuse contact for that IP using this tool. (2) Email the abuse address with: the IP address, timestamp (with timezone), the nature of the abuse (spam, scanning, brute-force), and any relevant log entries. (3) Include your own IP/domain and the logs showing the offending activity. For Indian ISPs: Jio abuse contacts are typically [email protected] or the APNIC-registered abuse-c role. For cloud providers like AWS: [email protected] handles abuse reports, with a web form at aws.amazon.com/premiumsupport/knowledge-center/report-aws-abuse/. For Cloudflare IPs acting as a CDN: [email protected] — note that Cloudflare is just a proxy and will forward to the actual website owner.