Autonomous system
AS9583 SIFY-AS-IN Sify Limited
Unclassified APNIC
Summary
Sify Technologies
isp transit residential hosting legacy
AS9583 (SIFY-AS-IN) is held by Sify Limited, now Sify Technologies, an Indian ICT company formerly known as Satyam Infoway. Sify was India's first private ISP and today sells enterprise connectivity over a national MPLS backbone, plus data-centre colocation, cloud and managed services. AS9583 is by far the largest AS in this part of the number range.
What it's used for
This is a carrier. RIS shows 2,187 IPv4 prefixes covering 795,648 addresses, 34 IPv6 prefixes, and — the figure that settles the role — 826 observed neighbours. An access network serving only its own subscribers peers with a handful of upstreams; 826 adjacencies means a large downstream customer cone plus heavy presence on the Indian exchanges. Sify runs a national network with thousands of points of presence, and the neighbour count is what that looks like in the routing table.
The eyeball side has not gone away. The largest blocks are a 223.30.0.0/15 and a long run of /20s out of 118.94.0.0/15, and reverse DNS across those /20s resolves address after address to retail.dynamic.sify.net, with 223-30-0-0.lan.sify.net and segment-95-118.sify.net filling in the rest. Retail and dynamic are broadband-pool words. The deaggregation into thousands of small prefixes fits the same picture: many regional POPs with per-region pools, announced piecemeal rather than as clean aggregates.
Notable
- Treat this AS as mixed when geolocating or reputation-scoring. A hit in
118.94.0.0/15is most likely an Indian consumer broadband address; elsewhere it is as likely to be an enterprise circuit or hosted service. - The IPv6 deployment is real rather than decorative: a
2001:e48::/32plus more-specific/48s. - Sify operates data centres across India, so the AS carries hosted traffic alongside the retail pools.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 18 exchanges in 7 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.226.6 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.210.192 |
| Equinix Internet Exchange Singapore | Singapore, Singapore | 27.111.228.121 |
| DE-CIX Mumbai | Mumbai, India | 103.27.171.143 |
| Extreme IX Mumbai | Mumbai, India | 103.77.108.43 |
| New York International Internet Exchange | New York, United States | 198.32.160.51 |
| National Internet Exchange of India - Mumbai | Mumbai, India | 218.100.48.123 |
| Extreme IX New Delhi | New Delhi, India | 45.120.248.177 |
Transit providers
34 upstream, 221 downstream and 358 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS55836 | Reliance Jio Infocomm Limited | 37,838 |
| AS7473 | Singapore Telecommunications Ltd | 27,224 |
| AS6453 | TATA COMMUNICATIONS (AMERICA) INC | 20,004 |
| AS3320 | Deutsche Telekom AG | 11,544 |
| AS6939 | Hurricane Electric LLC | 10,578 |
| AS1299 | Arelion Sweden AB | 4,434 |
| AS4755 | TATA Communications formerly VSNL is Leading ISP | 3,645 |
| AS24482 | SG.GS | 2,022 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 935 prefixes · 787K addresses IPv6 201 prefixes
| Country | Name | Prefixes |
|---|---|---|
| IN | India | 1,136 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9583- Registry name
- SIFY-AS-IN
- Abuse contact
- ipadmin@sifycorp.com
- Registered
- 2008-09-04
- Last changed
- 2013-04-07
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 92% valid · 2,050 valid, 171 with no ROA 5 RPKI-invalid
- ROAs
- 1,835 authorising AS9583
- ASPA
- no ASPA record
- IRR
- 99.9% registered · 2,223 of 2,226 announcements 2 other origin
- Route objects
- 5,845 naming AS9583
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere