IP Details For: 5.57.21.129 Decimal:87627137 Hostname:proxy-out-a.booking.com ASN:202196 ISP:Booking.com BV Services:Suspected Proxy Server Country:Netherlands (Kingdom of the) State/Region:Zuid-Holland City:Rotterdam Latitude:51.9225 (51° 55′ 21.00″ N) Longitude:4.4789 (4° 28′ 44.09″ E) Latitude and Longitude are often near the center of population. These values are not precise enough to be used to identify a specific address, individual, or for legal purposes. IP data from IP2Location. User Comments About 5.57.21.129No comments. Be the first to add one. Enter up to 500 characters in your comment about this IP address.If you have a question contact support or post in the Forums.