Autonomous System

AS21547

FirstLight Fiber, Inc.

FirstLight Fiber, Inc. United States 🌐 firstlight.net

Announced IPs

61,440

CIDR prefixes

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

Baseline (neutral) 65
Active-threat / abuse risk −12
Isp allocation +5
Trust score 58 / 100

Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

⚠ 3 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.

Prefix	Origin ASNs	Last detected (UTC)
206.147.101.0/24	AS21547, AS40160	2026-11-10 08:23:41
198.212.226.0/23	AS21547, AS397779	2026-11-10 08:23:41
198.212.225.0/24	AS21547, AS397779	2026-11-10 08:23:41

Network profile

Source: PeeringDB →

Geographic scope Not Disclosed

Traffic ratio Not Disclosed

Peering policy Open

IRR record AS21547:AS-ALL

Website ↗

Top CIDR ranges

CIDR	IPs	PTR Density	Organization	Country	State	City
64.140.192.0/20	4.1K	92.5%	FirstLight Fiber, Inc.	US	New Hampshire	Exeter
64.140.224.0/20	4.1K	98.9%	FirstLight Fiber, Inc.	US	New Hampshire	Dover
69.49.128.0/20	4.1K	98.7%	FirstLight Fiber, Inc.	US	Maine	Bethel
69.168.0.0/20	4.1K	98.6%	FirstLight Fiber, Inc.	US	New Hampshire	Lee
72.12.64.0/20	4.1K	98.6%	FirstLight Fiber, Inc.	US	Maine	Hebron
74.220.224.0/20	4.1K	99.0%	FirstLight Fiber, Inc.	US	New Hampshire	Somersworth
63.127.192.0/21	2.0K	0.1%	FirstLight Fiber, Inc.	US	—	—
64.140.216.0/21	2.0K	79.7%	FirstLight Fiber, Inc.	US	Massachusetts	Plymouth
64.140.248.0/21	2.0K	99.0%	FirstLight Fiber, Inc.	US	New Hampshire	Portsmouth
66.186.168.0/21	2.0K	86.3%	FirstLight Fiber, Inc.	US	—	—
66.186.184.0/21	2.0K	98.7%	FirstLight Fiber, Inc.	US	—	—
66.231.208.0/21	2.0K	98.8%	FirstLight Fiber, Inc.	US	—	—
69.49.144.0/21	2.0K	73.6%	FirstLight Fiber, Inc.	US	Maine	Lewiston
72.12.88.0/21	2.0K	98.8%	FirstLight Fiber, Inc.	US	Maine	Bethel
64.140.212.0/22	1.0K	98.6%	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	98.8%	FirstLight Fiber, Inc.	US	—	—
66.186.180.0/22	1.0K	98.9%	FirstLight Fiber, Inc.	US	—	—
66.231.192.0/22	1.0K	98.5%	FirstLight Fiber, Inc.	US	Maine	Lewiston
66.231.220.0/22	1.0K	98.7%	FirstLight Fiber, Inc.	US	—	—
69.49.152.0/22	1.0K	98.9%	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	98.9%	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	98.4%	FirstLight Fiber, Inc.	US	—	—
64.140.246.0/23	512	99.2%	FirstLight Fiber, Inc.	US	—	—
66.186.164.0/23	512	99.0%	FirstLight Fiber, Inc.	US	—	—
66.186.178.0/23	512	98.4%	FirstLight Fiber, Inc.	US	—	—
66.231.198.0/23	512	99.4%	FirstLight Fiber, Inc.	US	Maine	Jonesboro
66.231.202.0/23	512	99.2%	FirstLight Fiber, Inc.	US	—	—
66.231.204.0/23	512	98.8%	FirstLight Fiber, Inc.	US	Maine	Windham Center
69.49.156.0/23	512	99.4%	FirstLight Fiber, Inc.	US	Maine	Gardiner
72.12.80.0/23	512	98.6%	FirstLight Fiber, Inc.	US	—	—
72.55.228.0/23	512	98.4%	FirstLight Fiber, Inc.	US	Maine	Waterville
72.55.254.0/23	512	99.0%	FirstLight Fiber, Inc.	US	Maine	Sumner
64.140.211.0/24	256	98.8%	FirstLight Fiber, Inc.	US	—	—
64.140.245.0/24	256	99.6%	FirstLight Fiber, Inc.	US	—	—
66.186.166.0/24	256	99.2%	FirstLight Fiber, Inc.	US	—	—
66.186.176.0/24	256	98.4%	FirstLight Fiber, Inc.	US	—	—
66.231.197.0/24	256	98.8%	FirstLight Fiber, Inc.	US	Maine	Portland
66.231.200.0/24	256	97.7%	FirstLight Fiber, Inc.	US	—	—
66.231.217.0/24	256	98.4%	FirstLight Fiber, Inc.	US	—	—
66.231.219.0/24	256	99.6%	FirstLight Fiber, Inc.	US	—	—
72.12.82.0/24	256	99.2%	FirstLight Fiber, Inc.	US	—	—
72.55.232.0/24	256	99.6%	FirstLight Fiber, Inc.	US	Maine	Bangor
72.55.247.0/24	256	96.9%	FirstLight Fiber, Inc.	US	Maine	South Paris
72.55.252.0/24	256	98.8%	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.

Prefix	Announcement samples	Last seen
69.49.140.0/23	36,524	2026-11-10 07:46:50
72.12.75.0/24	32,420	2026-11-10 07:46:50
66.186.176.0/24	32,135	2026-11-10 07:46:50
69.49.146.0/24	31,230	2026-11-10 07:46:50
66.231.192.0/24	29,776	2026-11-10 07:46:50
198.212.230.0/24	29,424	2026-11-10 07:46:50
69.49.133.0/24	28,577	2026-11-10 07:46:50
66.186.173.0/24	25,202	2026-11-10 07:46:51
72.55.247.0/24	25,041	2026-11-10 07:46:51
69.49.128.0/24	24,901	2026-11-10 07:46:51
198.212.225.0/24	24,877	2026-11-10 07:46:50
69.49.129.0/24	24,852	2026-11-10 07:46:51
198.212.226.0/23	24,694	2026-11-10 07:46:50
72.12.76.0/23	24,267	2026-11-10 07:46:50
72.12.78.0/24	24,118	2026-11-10 07:46:50
72.12.79.0/24	24,082	2026-11-10 07:46:50
72.12.80.0/24	24,079	2026-11-10 07:46:50
66.186.184.0/24	23,975	2026-11-10 07:46:50
66.186.171.0/24	23,916	2026-11-10 07:46:50
72.12.94.0/23	23,807	2026-11-10 07:46:50
72.12.92.0/24	23,745	2026-11-10 07:46:50
66.186.162.0/24	23,649	2026-11-10 07:46:50
66.186.163.0/24	23,635	2026-11-10 07:46:50
72.12.87.0/24	23,626	2026-11-10 07:46:50
72.12.84.0/24	23,455	2026-11-10 07:46:50
66.186.188.0/24	23,418	2026-11-10 07:46:50
72.55.248.0/23	23,412	2026-11-10 07:46:50
72.55.254.0/23	23,131	2026-11-10 07:46:50
69.49.148.0/24	23,103	2026-11-10 07:46:50
69.49.144.0/24	22,962	2026-11-10 07:46:50
64.140.234.0/24	22,036	2026-11-10 07:46:50
64.140.199.0/24	21,895	2026-11-10 07:46:50
72.12.64.0/19	21,777	2026-11-10 07:46:50
72.12.91.0/24	21,619	2026-11-10 07:46:50
69.49.128.0/19	21,428	2026-11-10 07:46:50
74.220.236.0/24	21,361	2026-11-10 07:46:50
66.231.208.0/24	21,317	2026-11-10 07:46:50
66.231.219.0/24	21,294	2026-11-10 07:46:50
66.231.214.0/24	21,254	2026-11-10 07:46:50
66.231.217.0/24	21,254	2026-11-10 07:46:50
66.231.220.0/22	21,235	2026-11-10 07:46:50
66.231.215.0/24	21,235	2026-11-10 07:46:50
66.186.160.0/19	21,209	2026-11-10 07:46:50
69.49.153.0/24	21,094	2026-11-10 07:46:50
72.55.224.0/19	20,979	2026-11-10 07:46:50
140.165.50.0/24	20,672	2026-11-10 07:46:50
64.140.225.0/24	19,749	2026-11-10 07:46:50
64.140.224.0/19	19,742	2026-11-10 07:46:50
64.140.192.0/18	19,742	2026-11-10 07:46:50
64.140.224.0/24	19,732	2026-11-10 07:46:50

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: 2026-11-10 08:24:07 UTC