AS19577

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Summary

IP address summary information
Name	CASTRO TELECOM LLC
Country	United States
Website	host.io/ulisboa.pt·ulisboa.pt
Hosted domains	0
IPv4 addresses	1,024
IPv6 addresses	8.42 × 10²⁸
ASN type	Education
Registry	ARIN
Allocated	2 years ago on Jun 14, 2024
Updated	1 year ago on Feb 26, 2025

Ranking

#15,527

Overall rank

among 74,666 networks

Traffic

#19,706

Infrastructure

#9,842

#2,527inUnited States

Learn how ASN rankings work

Geolocation

Share of IPv4 footprint per hexagonLessMore

Countries by IPv4 share

Portugal
75.0%
United States
25.0%

Held location over 90 days: 85%
Held location over 1 year: 94%
Median days between moves: 10 days
Geolocation scope: Global

How consistently this network's IPs hold their geolocation. Read relative to the network type, not as a quality score.

Activity

A pronounced day/night rhythm — the signature of a consumer/eyeball network whose users sleep at night.

Mon

IP Ranges

Netblock	Company	Num of IPs
208.85.8.0/22	CASTRO TELECOM LLC	1,024
208.85.8.0/24	CASTRO TELECOM LLC	256

IP Ranges

WHOIS


  ASHandle:       █████
  OrgID:          █████
  ASName:         ██████
  ASNumber:       AS█████
  RegDate:        ████-██-██
  Updated:        ████-██-██
  TechHandle:     ████-████
  Source:         ████

Hosted Domains

There are 0 domain names hosted across 0 IP addresses on this ASN.

No domains found.

Places

Peers

There are 3 peers for this ASN.

ASN	Name	Rank
AS33733	CASTRO TELECOM LLC
AS62416	SAMPLING LINE-SERVICOS E INTERNET, LDA
AS200454	Tomas Oliveira Valente Leite de Castro

Upstreams

There are 2 upstreams for this ASN.

ASN	Name	Rank
AS62416	SAMPLING LINE-SERVICOS E INTERNET, LDA
AS200454	Tomas Oliveira Valente Leite de Castro

Downstreams

There are 1 downstreams for this ASN.

ASN	Name	Rank
AS33733	CASTRO TELECOM LLC

Pingable IPs

1 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more

IP Address	ASN	Details
208.85.9.0 Ping	AS19577CASTRO TELECOM LLC	0.20ms from Lisbon, PT

Other Pingable IPs

IP Address	ASN	Details
192.222.59.9 Ping	AS398090Lambda	0.34ms from Ashburn, US
69.60.37.41 Ping	AS7086Mississippi, Department of Information Technology Services (ITS)	15.06ms from Atlanta, US
78.22.214.153 Ping	AS6848Telenet BV	7.27ms from Brussels, BE
173.42.73.9 Ping	AS11426Charter Communications Inc	3.54ms from Charlotte, US
209.58.157.153 Ping	AS394380Leaseweb USA, Inc.	0.23ms from Dallas, US
173.185.183.201 Ping	AS7029Windstream Communications LLC	0.58ms from Dallas, US
115.245.91.121 Ping	AS55836Reliance Jio Infocomm Limited	1.47ms from Delhi, IN
13.70.32.57 Ping	AS8075Microsoft Corporation	0.28ms from Hong Kong, HK
175.197.63.57 Ping	AS4766Korea Telecom	1.42ms from Incheon, KR
43.248.24.217 Ping	AS18103Neuviz Net	0.44ms from Jakarta, ID

Pingable IPs

Important routers in AS19577


208.85.11.1	Charneca, Portugal
208.85.9.0	Lisbon, Portugal

Important routers in AS19577

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.Traceroute →

$ traceroute -a -n -q1 -f2 -m19 208.85.10.219

traceroute to 208.85.10.219 (208.85.10.219): 19 hops max, 52 byte packets

2 [AS136557] 103.216.222.52 0.115 ms

3 [AS136557] 103.216.222.7 0.119 ms

4 [AS136557] 103.216.222.134 0.107 ms

5 [AS174] 154.18.100.65 0.872 ms

6 [AS174] 154.54.47.29 46.156 ms

7 [AS174] 154.54.46.45 46.467 ms

8 [AS174] 154.54.47.230 184.855 ms

9 [AS174] 154.54.46.161 179.608 ms

10 [AS174] 154.54.89.142 193.293 ms

11 [AS174] 154.54.88.186 194.277 ms

12 [AS174] 154.54.10.222 195.184 ms

13 [AS6762] 213.144.168.215 361.543 ms

14 [AS6762] 213.144.187.251 384.705 ms

15 [AS6424] 193.109.188.7 383.952 ms

16 [AS62416] 185.222.11.27 391.026 ms

17 *

18 *

19 *

Measurement taken from

IPinfo ProbeNet in Perth, AU

On September 24, 2026

What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS19577 at robtex.

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AS19577

Summary

Ranking

Geolocation

Countries by IPv4 share

Activity

IP Ranges

IP Ranges

WHOIS

Hosted Domains

Places

Peers

Upstreams

Downstreams

Pingable IPs

Other Pingable IPs

Pingable IPs

Important routers in AS19577

Important routers in AS19577

Traceroute

Related Networks

AS14174

AS216449

AS27177

AS30004

AS32647

What is an ASN?

An API built with users in mind: reliable, accurate, and easy-to-use

Our IP tools

What is my IP?

Map IPs

Summarize IPs

Pingable IPs

Other Pingable IPs

Traceroute

Ranking

IP Ranges

Important routers in AS19577

Geolocation

Countries by IPv4 share

Activity

AS14174

AS216449

AS27177

AS30004

AS32647

AS33723