AS55102 NRG Energy, Inc.

NRG-NS-2 - NRG Energy, Inc. · registered in the United States

IPv4 addresses4,6088 prefixes · <0.001% of announced IPv4

Rank in United States#4,327largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#14,433of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS55102 in ASN lookup Look up an IP in this network (158.81.128.1) All networks in United States

IPv4 prefixes

All 8 prefixes, in address order.

158.81.128.0/24
158.81.136.0/21
158.81.150.0/24
158.81.152.0/24
158.81.154.0/23
158.81.192.0/23
158.81.199.0/24
158.81.200.0/23

Other ASNs named NRG Energy, Inc.

1 other network uses the same organisation name; together with AS55102 they announce 6,912 IPv4 addresses.

ASNNameIPv4 addresses

AS20404AS20404 - NRG Energy, Inc. US2,304

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources