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Autonomous System

AS21547

FirstLight Fiber, Inc.

FirstLight Fiber, Inc. United States 🌐 firstlight.net
Announced IPs
61,440
CIDR prefixes
50
ASN
AS21547

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

58/100
Caution
How this score is built

Experimental · trust-vectors model v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →

⚠ 2 MOAS prefixes — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS21547 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.

PrefixOrigin ASNsLast detected (UTC)
198.212.226.0/23 AS21547, AS397779 2026-10-15 12:29:11
198.212.225.0/24 AS21547, AS397779 2026-10-15 12:29:11

Network profile

Source: PeeringDB →
Geographic scope Not Disclosed
Traffic ratio Not Disclosed
Peering policy Open
IRR record AS21547:AS-ALL
Website ↗

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
64.140.192.0/20 4.1K
92.7%
FirstLight Fiber, Inc. US New Hampshire Exeter
64.140.224.0/20 4.1K
98.6%
FirstLight Fiber, Inc. US New Hampshire Dover
69.49.128.0/20 4.1K
98.5%
FirstLight Fiber, Inc. US Maine Bethel
69.168.0.0/20 4.1K
98.9%
FirstLight Fiber, Inc. US New Hampshire Lee
72.12.64.0/20 4.1K
98.6%
FirstLight Fiber, Inc. US Maine Turner
74.220.224.0/20 4.1K
98.8%
FirstLight Fiber, Inc. US New Hampshire Newmarket
63.127.192.0/21 2.0K
0.0%
FirstLight Fiber, Inc. US — —
64.140.216.0/21 2.0K
79.0%
FirstLight Fiber, Inc. US Massachusetts Plymouth
64.140.248.0/21 2.0K
98.8%
FirstLight Fiber, Inc. US New Hampshire Portsmouth
66.186.168.0/21 2.0K
86.1%
FirstLight Fiber, Inc. US — —
66.186.184.0/21 2.0K
98.7%
FirstLight Fiber, Inc. US — —
66.231.208.0/21 2.0K
98.5%
FirstLight Fiber, Inc. US — —
69.49.144.0/21 2.0K
73.9%
FirstLight Fiber, Inc. US Maine Turner
72.12.88.0/21 2.0K
98.7%
FirstLight Fiber, Inc. US Maine Bethel
64.140.212.0/22 1.0K
99.6%
FirstLight Fiber, Inc. US New Hampshire Exeter
64.140.240.0/22 1.0K
99.0%
FirstLight Fiber, Inc. US New Hampshire Portsmouth
66.186.160.0/22 1.0K
98.9%
FirstLight Fiber, Inc. US — —
66.186.180.0/22 1.0K
99.0%
FirstLight Fiber, Inc. US — —
66.231.192.0/22 1.0K
99.2%
FirstLight Fiber, Inc. US Maine Lewiston
66.231.220.0/22 1.0K
98.4%
FirstLight Fiber, Inc. US — —
69.49.152.0/22 1.0K
98.4%
FirstLight Fiber, Inc. US Maine Bethel
72.12.84.0/22 1.0K
99.0%
FirstLight Fiber, Inc. US — —
72.55.224.0/22 1.0K
98.8%
FirstLight Fiber, Inc. US Maine Bethel
72.55.240.0/22 1.0K
99.3%
FirstLight Fiber, Inc. US Maine Bethel
72.55.248.0/22 1.0K
98.2%
FirstLight Fiber, Inc. US Maine West Paris
64.140.208.0/23 512
99.2%
FirstLight Fiber, Inc. US — —
64.140.246.0/23 512
97.9%
FirstLight Fiber, Inc. US — —
66.186.164.0/23 512
99.0%
FirstLight Fiber, Inc. US — —
66.186.178.0/23 512
98.2%
FirstLight Fiber, Inc. US — —
66.231.198.0/23 512
99.6%
FirstLight Fiber, Inc. US Maine Jonesboro
66.231.202.0/23 512
98.4%
FirstLight Fiber, Inc. US — —
66.231.204.0/23 512
98.6%
FirstLight Fiber, Inc. US Maine Lewiston
69.49.156.0/23 512
98.0%
FirstLight Fiber, Inc. US Maine Gardiner
72.12.80.0/23 512
99.8%
FirstLight Fiber, Inc. US — —
72.55.228.0/23 512
98.4%
FirstLight Fiber, Inc. US Maine Waterville
72.55.254.0/23 512
99.2%
FirstLight Fiber, Inc. US Maine Sumner
64.140.211.0/24 256
98.0%
FirstLight Fiber, Inc. US — —
64.140.245.0/24 256
100.0%
FirstLight Fiber, Inc. US — —
66.186.166.0/24 256
98.0%
FirstLight Fiber, Inc. US — —
66.186.176.0/24 256
98.0%
FirstLight Fiber, Inc. US — —
66.231.197.0/24 256
98.8%
FirstLight Fiber, Inc. US Maine Portland
66.231.200.0/24 256
98.4%
FirstLight Fiber, Inc. US — —
66.231.217.0/24 256
97.7%
FirstLight Fiber, Inc. US — —
66.231.219.0/24 256
99.2%
FirstLight Fiber, Inc. US — —
72.12.82.0/24 256
99.6%
FirstLight Fiber, Inc. US — —
72.55.232.0/24 256
98.4%
FirstLight Fiber, Inc. US Maine Bangor
72.55.247.0/24 256
99.6%
FirstLight Fiber, Inc. US Maine South Paris
72.55.252.0/24 256
98.4%
FirstLight Fiber, Inc. US Maine South Portland
140.165.50.0/24 256
0.0%
FirstLight Fiber, Inc. US — —
198.212.225.0/24 256
0.0%
FirstLight Fiber, Inc. US — —
198.212.226.0/24 256
0.0%
FirstLight Fiber, Inc. US — —
198.212.230.0/24 256
0.0%
FirstLight Fiber, Inc. US — —

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS21547 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
69.49.140.0/23 31,664 2026-10-15 12:29:55
72.12.75.0/24 27,375 2026-10-15 12:29:55
66.186.176.0/24 27,073 2026-10-15 12:29:55
69.49.146.0/24 26,234 2026-10-15 12:29:39
66.231.192.0/24 24,786 2026-10-15 12:29:39
198.212.230.0/24 24,593 2026-10-15 12:29:13
69.49.133.0/24 23,995 2026-10-15 12:29:39
72.12.76.0/23 20,682 2026-10-15 12:29:39
198.212.225.0/24 20,599 2026-10-15 12:29:23
72.12.78.0/24 20,537 2026-10-15 12:29:39
72.12.79.0/24 20,512 2026-10-15 12:29:39
72.12.80.0/24 20,509 2026-10-15 12:29:39
198.212.226.0/23 20,416 2026-10-15 12:29:40
66.186.184.0/24 20,394 2026-10-15 12:29:39
66.186.171.0/24 20,350 2026-10-15 12:29:55
72.12.94.0/23 20,233 2026-10-15 12:29:40
72.12.92.0/24 20,182 2026-10-15 12:29:44
66.186.162.0/24 20,074 2026-10-15 12:29:39
72.12.87.0/24 20,065 2026-10-15 12:29:55
66.186.163.0/24 20,064 2026-10-15 12:29:40
72.12.84.0/24 19,895 2026-10-15 12:29:39
72.55.248.0/23 19,885 2026-10-15 12:29:55
66.186.188.0/24 19,849 2026-10-15 12:29:39
66.186.173.0/24 19,638 2026-10-15 12:29:38
72.55.254.0/23 19,604 2026-10-15 12:29:47
69.49.148.0/24 19,572 2026-10-15 12:29:47
72.55.247.0/24 19,499 2026-10-15 12:29:38
69.49.144.0/24 19,436 2026-10-15 12:29:59
69.49.128.0/24 19,369 2026-10-15 12:29:55
69.49.129.0/24 19,328 2026-10-15 12:29:55
72.12.64.0/19 18,506 2026-10-15 12:29:39
64.140.234.0/24 18,453 2026-10-15 12:29:39
72.12.91.0/24 18,350 2026-10-15 12:29:40
64.140.199.0/24 18,328 2026-10-15 12:29:55
69.49.128.0/19 18,185 2026-10-15 12:29:39
66.186.160.0/19 17,922 2026-10-15 12:29:39
69.49.153.0/24 17,868 2026-10-15 12:29:39
74.220.236.0/24 17,811 2026-10-15 12:29:55
66.231.208.0/24 17,754 2026-10-15 12:29:55
66.231.219.0/24 17,740 2026-10-15 12:29:52
72.55.224.0/19 17,731 2026-10-15 12:29:39
66.231.214.0/24 17,686 2026-10-15 12:29:39
66.231.217.0/24 17,684 2026-10-15 12:29:39
66.231.215.0/24 17,682 2026-10-15 12:29:39
66.231.220.0/22 17,668 2026-10-15 12:29:39
140.165.50.0/24 17,307 2026-10-15 12:14:09
64.140.225.0/24 16,476 2026-10-15 12:29:39
64.140.224.0/19 16,475 2026-10-15 12:29:39
64.140.192.0/18 16,470 2026-10-15 12:29:39
64.140.224.0/24 16,456 2026-10-15 12:29:39

Showing top 50 of 70 announced prefixes by sample volume.

Frequently Asked Questions

What is AS21547?

AS21547 is an Autonomous System Number assigned to FirstLight Fiber, Inc.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS21547 announce?

AS21547 announces 61.4K IPv4 addresses distributed across 50 routed CIDR prefixes. The network is registered in United States.

Who operates AS21547?

AS21547 is operated by FirstLight Fiber, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.

What country is AS21547 registered in?

AS21547 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-10-15 12:39:05 UTC
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