AS201483 BLSIT-AS B.L.S. Consulting S.r.l.

AS overview

Test target: 2a06:52c0:1::1 · static prefix probe · address space: PA · prefixes announced: 2

prefix(es): 2a06:52c0:1::/48, 2a06:52c0:2::/48

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a06:52c0:1::1`	prb	✓	✗	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓	✓	✗	open	open	✓

RPKI & ASPA

0 of 2 prefix(es) covered by a valid ROA, 2 not-found.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a06:52c0:1::/48`	- not-found	no covering VRP
`2a06:52c0:2::/48`	- not-found	no covering VRP

Random-IP probe (yarrp) into the AS' prefixes

We probed 70 arbitrary IPv6 address(es) inside AS201483's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a03:b020:1:2e::b at hop 17 - that router answers ICMPv6 Echo. This is not in AS201483's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:04:59Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) echo onlyRFC 4890 ✓

filter likely at: destination AS201483 (BLSIT-AS) · min PMTU on path: 1480

3/4

Echo small (56B) 54.6ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.3ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.3ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2001:67c:128c::699	18.0ms	0%	-	NA
5	hu0-15-0-0.lontr4.London.opentransit.net 2001:688:0:2::c3	40.5ms	0%	AS5511	Opentransit - Orange S.A., FR
6	*	-	-	-
7	be4.core2.ams2.he.net 2001:470:0:293::2	42.8ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	*	-	-	-
9	100ge0-0-0-16.core1.dus1.he.net 2001:470:0:371::2	44.4ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	tserv2.dus1.he.net 2001:470:0:3b2::2	39.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
11	tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net 2001:470:12:1d4::2	63.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
12	2a06:52c0:1::1	53.4ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

tracepath -6

 1?: [LOCALHOST]                        0.013ms pmtu 1500
 1:  _gateway                                              0.478ms 
 1:  _gateway                                              0.387ms 
 2:  sox-pn.sox.rs                                         0.592ms 
 3:  2001:7f8:1e:8::3d                                     0.732ms asymm  2 
 4:  2001:67c:128c::699                                   18.129ms 
 5:  hu0-15-0-0.lontr4.London.opentransit.net             41.637ms asymm  6 
 6:  no reply
 7:  be4.core2.ams2.he.net                                42.039ms 
 8:  no reply
 9:  100ge0-0-0-16.core1.dus1.he.net                      40.491ms asymm  8 
10:  tserv2.dus1.he.net                                   39.506ms asymm  9 
11:  tserv2.dus1.he.net                                   38.764ms pmtu 1480
11:  tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net      64.361ms asymm 10 
12:  2a06:52c0:1::1                                       54.668ms reached
     Resume: pmtu 1480 hops 12 back 7

From DE host (Berlin) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 39.5ms

4/4

Echo 1500B (DF) 24.6ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.6ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-10.cr10.ber03.lwlcom.net 2a00:c380:b200:230::220	0.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-15.cr11.dtm01.lwlcom.net 2a00:c380:b200:230::5	8.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-10.cr10.dtm02.lwlcom.net 2a00:c380:b200:230::255	8.5ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-50.cr10.dus02.lwlcom.net 2a00:c380:b200:230::24	8.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-20.cr10.dus01.lwlcom.net 2a00:c380:b200:230::108	8.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	ae6-60.cr10.ams01.lwlcom.net 2a00:c380:b200:230::213	11.5ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
9	2001:7f8:12a::18	15.0ms	0%	-	NA
10	2a03:b020::247	24.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
11	2a06:52c0:1::1	24.3ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

tracepath -6

 1?: [LOCALHOST]                        0.021ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.498ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.568ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.155ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.080ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.793ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          8.682ms asymm  4 
 6:  ae0-50.cr10.dus02.lwlcom.net                          8.663ms asymm  3 
 7:  ae0-10.cr10.dus01.lwlcom.net                          8.869ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.703ms asymm  5 
 9:  2001:7f8:12a::18                                     15.084ms asymm  4 
10:  2a03:b020::247                                       24.869ms asymm  4 
11:  2a06:52c0:1::1                                       24.521ms reached
     Resume: pmtu 1500 hops 11 back 5

From DE host (Düsseldorf) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 12.8ms

4/4

Echo 1500B (DF) 12.9ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ipv6.de-cix.dus.as41327.fibertelecom.com 2001:7f8:9e::a16f:0:1	4.0ms	0%	-	NA
3	2a03:b020::247	12.8ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
4	2a06:52c0:1::1	12.7ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.298ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.286ms 
 2:  ipv6.de-cix.dus.as41327.fibertelecom.com              4.084ms 
 3:  2a03:b020::247                                       13.066ms 
 4:  2a06:52c0:1::1                                       13.056ms reached
     Resume: pmtu 1500 hops 4 back 4

From NL host (go6lab) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 20.7ms

4/4

Echo 1500B (DF) 84.8ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	0.9ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	speed-ix.fibertelecom.it 2001:7f8:b7::a504:1327:1	6.7ms	0%	-	NA
4	2a03:b020::247	30.5ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a06:52c0:1::1	26.0ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

tracepath -6

 1?: [LOCALHOST]                        0.051ms pmtu 1500
 1:  2a00:8642:42::2                                       1.509ms 
 1:  2a00:8642:42::2                                       2.143ms 
 2:  gw.friends.steffann.nl                                3.060ms 
 3:  speed-ix.fibertelecom.it                              5.009ms 
 4:  2a03:b020::247                                       23.101ms 
 5:  2a06:52c0:1::1                                       20.211ms reached
     Resume: pmtu 1500 hops 5 back 5

From ITA host (Karsolink) echo onlyRFC 4890 ✓

filter likely at: destination AS201483 (BLSIT-AS) · min PMTU on path: 1480

4/4

Echo small (56B) 28.6ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	8.5ms	60%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	be47.core1.mil2.he.net 2001:470:e:69::2	12.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be1.core1.zrh2.he.net 2001:470:e:dd::2	14.7ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be10.core4.fra1.he.net 2001:470:e:153::1	21.3ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	100ge0-0-0-17.core1.dus1.he.net 2001:470:0:52e::2	25.6ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	tserv2.dus1.he.net 2001:470:0:3b2::2	24.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net 2001:470:12:1d4::2	46.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
11	2a06:52c0:1::1	24.7ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

Rate-limited ICMPv6: hop 3, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  no reply
 4:  no reply
 5:  be47.core1.mil2.he.net                               13.877ms 
 6:  be1.core1.zrh2.he.net                                14.980ms 
 7:  be10.core4.fra1.he.net                               20.636ms 
 8:  100ge0-0-0-17.core1.dus1.he.net                      23.395ms 
 9:  tserv2.dus1.he.net                                   22.473ms 
10:  tserv2.dus1.he.net                                   22.214ms pmtu 1480
10:  tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net      46.473ms 
11:  2a06:52c0:1::1                                       25.241ms reached
     Resume: pmtu 1480 hops 11 back 6

From SLO host (6connect) echo onlyRFC 4890 ✓

filter likely at: destination AS201483 (BLSIT-AS) · min PMTU on path: 1480

4/4

Echo small (56B) 38.0ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	2a03:a100:0:201:1::1	0.8ms	0%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	e0-1.core1.lju1.he.net 2001:470:1:5be::1	2.6ms	30%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	9.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	be3.core1.prg1.he.net 2001:470:e:a7::1	12.9ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be8.core4.fra1.he.net 2001:470:e:1e::1	19.4ms	30%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	100ge0-0-0-17.core1.dus1.he.net 2001:470:0:52e::2	22.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	tserv2.dus1.he.net 2001:470:0:3b2::2	19.9ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net 2001:470:12:1d4::2	45.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
11	2a06:52c0:1::1	35.7ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

Rate-limited ICMPv6: hop 4, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.712ms 
 1:  fw1-lju.6connect.com                                  0.632ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.035ms 
 4:  2a03:a100:0:201:1::1                                  0.721ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.350ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        7.775ms 
 6:  be3.core1.prg1.he.net                                13.208ms 
 7:  be8.core4.fra1.he.net                                18.796ms 
 8:  100ge0-0-0-17.core1.dus1.he.net                      22.719ms 
 9:  tserv2.dus1.he.net                                   20.248ms 
10:  tserv2.dus1.he.net                                   20.213ms pmtu 1480
10:  tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net      45.263ms 
11:  2a06:52c0:1::1                                       36.749ms reached
     Resume: pmtu 1480 hops 11 back 12

From SLO host (T-2) echo onlyRFC 4890 ✓

filter likely at: destination AS201483 (BLSIT-AS) · min PMTU on path: 1480

4/4

Echo small (56B) 36.5ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a01:260:1::225	11.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	2.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2a01-260-1-1--39.core6.t-2.net 2a01:260:1:1::39	2.6ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
5	hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1	33.6ms	0%	-	NA
6	*	-	-	-
7	tserv2.dus1.he.net 2001:470:0:3b2::2	37.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net 2001:470:12:1d4::2	67.7ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	tunnel578905-pt.tunnel.tserv18.dus1.ipv6.he.net 2001:470:12:1d4::2	61.9ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	2a06:52c0:1::1	37.4ms	0%	AS201483	BLSIT-AS - B.L.S. Consulting S.r.l., IT

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       6.204ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.447ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        2.759ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  39.779ms asymm  4 
 6:  100ge0-0-0-16.core1.dus1.he.net                      45.737ms 
 7:  100ge0-0-0-16.core1.dus1.he.net                      42.524ms asymm  6 
 8:  tserv2.dus1.he.net                                   42.707ms asymm  7 
 9:  tserv2.dus1.he.net                                   40.101ms pmtu 1480
 9:  2a06:52c0:1::1                                       35.929ms reached
     Resume: pmtu 1480 hops 9 back 7